Sennheiser CX Plus / CX Plus SE / CX 500BT True Wireless Manual

Important safety instructions

• Read this instruction manual carefully and completely before using the product.
• Always include this instruction manual when passing the product on to third parties.
• Do not use the product if it is obviously defective or makes loud, unusual (whistling or beeping) noise.
• Only use the product in environments where Bluetooth® wireless transmission is permitted.

Preventing damage to health and accidents

• Protect your hearing from high volume levels. Permanent hearing damage may occur when headphones are used at high volume levels for long periods of time. Headphones of the Sennheiser brand sound exceptionally good even at low and medium volume levels.
  
• Do not insert the earphones too deep into your ears and never insert them without ear adapters. Always remove the earphones slowly and carefully from your ears.
• The product generates stronger permanent magnetic fields that could cause interference with cardiac pacemakers, implanted defibrillators (ICDs) and other implants. Always maintain a distance of at least 3.94"/10 cm between the product component containing the magnet (earbuds and charging case) and the cardiac pacemaker, implanted defibrillator, or other implant.
  
• Keep the product, accessories and packaging parts out of reach of children and pets to prevent accidents. Swallowing and choking hazard.
• Do not use the product in an environment that requires your special attention (e.g. in traffic). Especially the product's active noise cancellation can make ambient noise inaudible or drastically change the perception of acoustic warning signals.

Preventing damage to the product and malfunctions

• Always keep the product dry and do not expose it to extreme temperatures (hairdryer, heater, extended exposure to sunlight, etc.) to avoid corrosion or deformation. The normal operating temperature is from 0°C to 40°C/32°F to 104°F.
• To avoid loud, unusual (whistling or beeping) noise and to ensure proper noise cancellation, do not cover the microphone openings of the active noise cancellation circuitry located on the outside of the earbuds.
• Use only attachments/accessories/spare parts supplied or recommended by Sonova Consumer Hearing.
• Clean the product only with a soft, dry cloth.

Safety instructions for lithium-ion rechargeable batteries

If abused or misused, rechargeable batteries may leak. In extreme cases, they may even present a risk of:

• explosion,
• heat and fire development
• smoke or gas development
• damage to health and/or the environment

	Only use rechargeable batteries and chargers recommended by Sonova Consumer Hearing.
	Do not leave the product / rechargeable batteries unattended while charging.
	Only charge the product / rechargeable batteries at ambient temperatures between 10°C and 40°C/41°F and 95°F and do not charge them near easily flammable objects.
	Do not heat the product / rechargeable batteries above 70°C/158°F. Avoid exposure to sunlight and do not throw the product / rechargeable batteries into fire.
	Switch rechargeable battery-powered products off after use.
	When not using the product / rechargeable batteries for extended periods of time, charge them regularly (about every three months).
	This product contains coin rechargeable batteries. If you think the product / a coin rechargeable battery has been swallowed or is lodged in the body, seek medical assistance immediately.
	Avoid prolonged skin contact with the product, rechargeable battery, charger or charging cable when connected to a power source. These components can heat up during charging and cause skin irritation.
	Dispose of defective products with built-in rechargeable batteries at special collection points or return them to your specialist dealer to facilitate recycling.

Notes on the ingress protection rating of the earbuds
The earbuds feature an IPX4 ingress protection rating which means they are protected from the ingress of water (protection class according to International Protection Marking (IP code), IEC standard 60529, tested under laboratory conditions).
The earbuds can be used in the rain, for example. However, they are not suitable for immersion in water or for wearing in the shower. In case of permanent moisture/wetness, the ingress protection can be reduced and the product can be damaged.
Do not charge wet earbuds. Completely dry wet earbuds with a dry cloth before charging them.
The charging case is not splash waterproof. Always keep the charging case dry.

Notes on data collection and processing and on firmware updates
This product stores individual settings such as the volume, the sound profiles and the Bluetooth connection data of paired devices. This data is required for the operation of the product and is not transferred to Sonova Consumer Hearing GmbH or companies commissioned by Sonova Consumer Hearing GmbH and is not processed.
Using the "Sennheiser Smart Control" app, you can update the firmware of the product for free via an Internet connection. If the device on which the app is installed is connected to the Internet, the following data is automatically transferred to and processed by Sonova Consumer Hearing GmbH servers in order to provide and transfer suitable firmware updates: hardware identifier, hardware revision number, firmware version of the product, operating system type (Android, iOS) and version, version of the app. The data will only be used as specified and will not be stored permanently.
If you do not want this data to be transferred and processed, do not connect to the Internet.

Intended use/Liability
These headphones have been designed as an accessory for Bluetooth compliant devices. They are intended for wireless audio communication such as music playback and phone calls via Bluetooth wireless technology.
It is considered improper use when the product is used for any application not named in the corresponding product documentation.
Sonova Consumer Hearing GmbH does not accept liability for damage arising from misuse or improper use of the product and its attachments/accessories.
Sonova Consumer Hearing GmbH is not liable for damages to USB devices that are not consistent with the USB specifications.
Sonova Consumer Hearing GmbH is not liable for damages resulting from the loss of connection due to flat or overaged rechargeable batteries or exceeding the Bluetooth transmission range.
Before putting the product into operation, please observe the respective country-specific regulations.

Package contents

	Earbud R for right ear (model: CXPLUSTW1 R) and earbud L for left ear (model: CXPLUSTW1 L)
	Charging case (model: CXPLUSTW1 C) with built-in rechargeable battery for the earbuds
	USB charging cable with USB-C and USB-A connector, length approx. 0.25 m
	Silicone ear adapters (size XS, S, M (pre-mounted to the earbuds) and L)
	Quick guide
	Safety guide

Online you can find:

• this detailed instruction manual and additional information (www.sennheiser-hearing.com/download)
• the Sennheiser Smart Control app for configuring the headphones and for additional functions (www.sennheiser-hearing.com/smartcontrol)

A list of accessories can be found on the CX Plus True Wireless product page at www.sennheiser-hearing.com. Contact your local Sonova Consumer Hearing partner: www.sennheiser-hearing.com/service-support.

Product overview

Charging case
Model: CXPLUSTW1 C

1. LED displays the charging process/charge status of the rechargeable battery of the charging case or of the earbuds (when inserted into the charging case)
2. Input for USB-C connector for charging the rechargeable batteries
3. Built-in rechargeable battery for charging the earbuds on the go
4. Type plate
5. Charging compartment for the left earbud L
6. Magnetic holders
7. Charging compartment for the right earbud R
8. Charging contacts

Earbuds
Model: CXPLUSTW1 R and CXPLUSTW1 L

10. Touch control panel
11. Changeable silicone ear adapters
12. Left earbud L
13. Status LED
14. Infra-red carrying senor
15. Magnetic holders
16. Charging contacts
17. Microphones for the active noise cancellation ANC, for the perception of ambient noise ("Transparency Mode") and for phone calls
18. Right earbud R
19. Built-in rechargeable battery

Overview of the LED indications of the charging case

When a USB cable is connected, the LED of the charging case permanently displays the charging process:

LED		Charging case WITH earbuds inserted	Charging case WITHOUT earbuds inserted
	pulses yellow	... earbuds and charging case are being charged	... charging case is being charged
	lights up green	... earbuds and charging case are fully charged	... charging case is fully charged
	flashes red	... a charging error/ battery error has been detected in at least one earbud	... a charging error/ battery error has been detected in the charging case

If you open the lid of the charging case and no USB cable is connected, the LED of the charging case displays the battery charge status or the charging process of the earbuds. If you close the lid of the charging case, the LED will go off after 5 seconds.

LED		Charging case WITH earbuds inserted	Charging case WITHOUT earbuds inserted
	lights up green	... earbuds are fully charged and the charging case can still charge at least one complete cycle	... charging case is fully charged
	pulses yellow	... earbuds are being charged via the rechargeable battery of the charging case	–
	lights up yellow	... earbuds are fully charged, the charging case cannot charge another complete cycle	... charging case is charged less than 50%
	lights up red	... rechargeable batteries of the earbuds and the charging case are empty	... rechargeable battery of the charging case is empty
	flashes red	... a charging error/ battery error has been detected in at least one earbud	... a charging error/ battery error has been detected in the charging case

If the LED does not light up:

• Clean the contacts on the earbuds and in the charging case.
• Charge the rechargeable batteries of the earbuds and the charging case until the LED lights up again.

Overview of the LED indications of the earbuds

LED		Meaning; the earbuds...
	flashes red-blue for approx. 1 minute	... are in Bluetooth pairing mode
3x	flashes blue 3x	... Bluetooth pairing or earbud pairing successful
3x	flashes red 3x	... Bluetooth pairing or earbud pairing failed
	lights up blue	... are connected to a device via Bluetooth
	lights up red	... are not connected to a device via Bluetooth or the connection has been lost
	flashes red quickly	... rechargeable battery is almost empty
	flashes red slowly	... system error – perform a reset
	flashes redgreen for approx. 1 minute	... are in earbud pairing mode (to pair the right and left earbud)

When you insert the earbuds into your ears, the LEDs of the earbuds automatically go off.

Notes on voice prompts
The earbuds output voice prompts for events (the table gives some examples). Using the Smart Control app, you can change the language of the voice prompts, choose between voice prompts and beep sounds, or deactivate the status messages with a few exceptions (e.g. rechargeable battery is empty).

Getting started

1. Waking up the earbuds and the charging case and charging the rechargeable batteries
   Upon delivery, the rechargeable batteries of the earbuds and the charging case are in sleep mode and have to be woken up by connecting them to a power source once.
   

• Insert the earbuds into the charging case.
• Connect the USB-C cable to the charging case and to a USB power source.
  The earbuds and the charging case are woken up and th e rechargeable batteries are being charged. The earbuds are now ready for use.

2. Selecting suitable ear adapters for optimum fit of the earbuds
   The perceived sound quality including bass performance and the best possible noise cancellation depend to a large extent on the correct fit of the earbuds in the ear.
   

• Test which ear adapter size gives you the best sound quality and the best wearing comfort.
• You can choose between 4 different ear adapters in size XS, S, M and L.
  
• Assign the right earbud to your right ear and the left earbud to your left ear.
• Insert the earbuds at a slight angle into the ears and twist them slightly into the ear canal so that they sit comfortably and snugly in the ear canal.

3. Connecting the earbuds to a Bluetooth device
   Connect the earbuds to your smartphone via Bluetooth.
   
4. Installing the Smart Control app on your smartphone
   The Sennheiser Smart Control app allows you to use all functions and settings of the headphones and to e.g. adjust the sound to your liking using the equalizer.
   
   
   
   
   

Using the earbuds

Information on the rechargeable battery, the charging process and the first use
The earbuds and the charging case each have a built-in rechargeable battery. The charging case allows you to store the earbuds safely at all times while they are being charged.

Upon delivery, the rechargeable batteries of the earbuds and the charging case are in sleep mode and have to be woken up by connecting them to a power source once. Sonova Consumer Hearing recommends charging the earbuds and the charging case for a complete charging cycle without interruption before using for the first time.
A complete charging cycle of the charging case and the earbuds takes about 1.5 hours. The quick charge function gives you approx. 1 hour of playback time after 10 minutes of charging.
Sonova Consumer Hearing recommends using the supplied USB cable and a compatible standard USB power supply for charging the headphones.
When a USB cable connected to a power source is also connected to the charging case, the rechargeable battery of the charging case is being charged. When the earbuds are inserted into the charging case, their rechargeable batteries are being charged at the same time. The LED of the charging case displays the charge status.
When the battery charge of the earbuds drops to a critical level, a voice prompt asks you to recharge the earbuds ("Recharge headset").
The charge status of the rechargeable battery of the charging case is displayed by the LED on the charging case.

Charging the rechargeable battery of the earbuds and the charging case

1. Open the charging case by overcoming a slight magnetic resistance and insert the left earbud into the left charging compartment and the right earbud into the right charging compartment. The earbuds are magnetically pulled into the charging compartments.
2. Connect the USB-C connector of the USB cable to the USB- Socket of the charging case.
3. Connect the USB-A connector to a corresponding socket of a USB power source (to be ordered separately). Make sure that the US B power source is connected to the power supply system. The rechargeable batteries of the earbuds and the charging cas e are being charged.
   If no earbuds are inserted into the charging case, only the rechargeable battery of the charging case is being charged.
   The LED of the charging case displays the charge status:

LED		Charging case WITH earbuds inserted	Charging case WITHOUT earbuds inserted
	pulses yellow	... earbuds and charging case are being charged	... charging case is being charged
	lights up green	... earbuds and charging case are fully charged	... charging case is fully charged
	flashes red	... a charging error/ battery error has been detected in at least one earbud	... a charging error/ battery error has been detected in the charging case

If the LED does not light up:

• Clean the contacts on the earbuds and in the charging case.
• Charge the rechargeable batteries of the earbuds and the charging case (at least 30 minutes) until the LED lights up again.

Connecting the earbuds to a Bluetooth device
To be able to use the Bluetooth wireless connection, you must register both devices (earbuds and e.g. smartphone) via the device settings of your smartphone. This process is called pairing.
If operation differs from the steps mentioned, also refer to the instruction manual of the Bluetooth device you are using.
When you switch on the earbuds for the first time after initial charging, they automatically switch to Bluetooth pairing mode.

Information on the Bluetooth wireless connection
The earbuds are compatible with Bluetooth 5.2.
If your audio source supports one of the following high-resolution audio encoding methods, music is automatically played in high audio quality: aptX®, aptX adaptive® or AAC. Otherwise the headphones will play your music in normal audio quality (SBC).
Paired devices establish the Bluetooth wireless connection immediately after switch-on and are ready for use.
When you switch the earbuds on, they automatically try to connect to the last connected Bluetooth device. The earbuds can save the connection profiles of up to six Bluetooth devices with which they have been paired. Audio playback is only possible from one device at a time.
If you pair the earbuds with the seventh Bluetooth device, the saved connection profile of the least used Bluetooth device will be overwritten. If you want to re-establish a connection with the overwritten Bluetooth device, you have to pair the earbuds again.
Using the Smart Control app, you can view the list of paired devices and selectively connect and disconnect devices ("Connections").

	Paired and connected Bluetooth device
	Paired Bluetooth device (currently not connected)

The right and the left earbud also use a Bluetooth wireless connection. Both earbuds are paired with each other upon delivery. If you are using a different earbud (e.g. a spare earbud), the two earbuds must also be paired with each other (> 34).

Pairing the earbuds with a Bluetooth device

1. Take both earbuds out of the charging case and insert them into your ears (> 20). The distance between the earbuds and the Bluetooth device should not exceed 40"/1 m.
   
2. Simultaneously touch and hold the right and the left touch control panel for 3 seconds until you hear the voice prompt "Pairing" and a beep.
   The LEDs of the earbuds flash blue and red. The earbuds are in pairing mode.
   
3. Activate Bluetooth on your Bluetooth device.
   
4. Via the menu of your Bluetooth device, start the search for new Bluetooth devices.
   All active Bluetooth devices in the proximity of your smartphon e are displayed.
   From the list of found Bluetooth devices, select "CX True Wireless". If necessary, enter the default pin code "0000".
   If pairing was successful, you hear the voice prompt "Pairing successful" and the LEDs of the earbuds flash blue 3x.
   

If no connection is established within 1 minute, pairing mode is terminated and the earbuds switch to idle mode. If necessary, repeat the steps described above.
If the earbuds are not paired with any Bluetooth device (the pairing list is empty), pairing mode is permanently active.

Switching the connection to paired Bluetooth devices/"Connections"
To selectively switch the audio connection to paired Bluetooth devices using the "Connections" function, you require the Smart Control app.

• In the Smart Control app, tap "Connections".
  The list of Bluetooth devices paired with the earbuds appears.
• From the list, select the paired device to which you want to connect the earbuds. Make sure that the desired device is switched on and Bluetooth is activated.
  The Bluetooth audio connection between the desired Bluetooth device and the earbuds is established.
  The app connection between the device with the Smart Control app installed and the earbuds remains active (only Bluetooth Low Energy for communication between app and earbuds, the device name is highlighted in bold).

Disconnecting the earbuds from a Bluetooth device

• Via the menu of your Bluetooth device, disconnect the connection to the earbuds.
  The earbuds are disconnected from the Bluetooth device. The earbuds then search for other paired devices. If no device is found, you hear the voice prompt "No connection". The headphones switch to idle mode.

Using the "Connections" function in the Smart Control app, you can also selectively connect the earbuds to paired devices without terminating an existing connection.
If you want to clear the Bluetooth pairing list of the earbuds, reset the earbuds to the factory default settings.

Pairing a spare earbud
The right and the left earbud are paired with each other upon delivery. If, however, you are using a different earbud (e.g. a spare earbud), you have to pair the two earbuds with each other once. This pairing process resets the earbuds to the factory default settings.

1. Insert both earbuds into the charging case and leave the lid of the charging case open.
   
2. After 20 seconds, the earbuds are paired with each other.
   The LED on the charging case then lights up red and green 3x.
   The earbuds are now paired with each other.
   

If you have closed the lid of the charging case too early, repeat the above procedure.
After the pairing process with a spare earbud, all settings are reset. Pair the earbuds with your smartphone again.

Installing the Smart Control app
To make full use of all the settings and functions of the headphones, you need to have the free Sennheiser Smart Control app installed on your smartphone.
Download the app from the Apple App Store or Google Play and install it on your smartphone. Alternatively, you can use your smartphone to scan the following QR code or to call up the following Internet site: www.sennheiser-hearing.com/smartcontrol

• Connect your smartphone to the earbuds using Bluetooth.
• Start the Smart Control app.
• Follow the instructions in the app.

Selecting suitable ear adapters for optimum fit of the earbuds

The perceived sound quality including bass performance and the best possible noise cancellation depends to a large extent on the correct fit of the earbuds in the ear.

• Pull the ear adapter away from the in-ear sound tunnel.
• Mount the new ear adapter to the in-ear sound tunnel. Ensure that it locks into place.
• Test which ear adapter size gives you the best sound quality and the best wearing comfort.
  You can choose between 4 different ear adapters in size XS, S, M and L. The ear adapters must fit snugly in the ear canal and completely seal your ears.

Inserting the earbuds into the ears

• Assign the right earbud to your right ear and the left earbud to your left ear.
• Insert the earbuds at a slight angle into the ears and twist them slightly into the ear canal so that they sit comfortably and snugly in the ear canal.

The right or left earbud can be used alone. If you insert one earbud into the charging case during use, a short interruption of playback may occur in the other earbud.
The Smart Pause function automatically stops music playback if you remove an earbud from your ear.

Switching the earbuds on

Danger of hearing damage due to high volume levels!
Listening at high volume levels can lead to permanent hearing defects.

• Before putting the headphones on, adjust the volume to a low level.
• Do not continuously expose yourself to high volume levels.

If you take the earbuds out of the charging case during an incoming call, the call is automatically accepted and you can use the earbuds directly for making calls. This Auto Call function can also be deactivated.
The earbuds automatically switch to idle mode if no paired Bluetooth device can be found within 15 minutes. You can also change this setting via the Smart Control app. You can wake up the earbuds from idle mode by touching their touch control panels 1x or by briefly inserting them into the charging case.

Switching the earbuds off

The earbuds do not have to be switched off explicitly.

• Insert the earbuds into the charging case to switch them off. As soon as the earbuds are inserted into the charging case, they switch off and are being charged.

The earbuds automatically switch to idle mode if no paired Bluetooth device can be found within 15 minutes. You can wake up the earbuds from idle mode by touching their touch control panels 1x or by briefly inserting them into the charging case.

Adjusting the volume

Danger of hearing damage due to high volume levels!
Listening at high volume levels can lead to permanent hearing defects.

• Before putting the headphones on and before toggling between audio sources, adjust the volume to a low level.
• Do not continuously expose yourself to high volume levels.
  

To increase the volume:

• Touch and hold the touch control panel of the right earbud until the volume is increased.

To reduce the volume:

• Touch and hold the touch control panel of the left earbud until the volume is reduced.

When the maximum or minimum volume is reached, you hear the voice prompt "Volume max" or "Volume min".
You can also adjust the volume using the connected Bluetooth device.

Information on active noise cancellation ANC
Due to the wearing style in the ear canal, the earbuds provide effective passive isolation from ambient noise.
In addition, the earbuds have an active noise cancellation (ANC ) function, which allows you to reduce ambient noise to a minimum. This feed forward system with one microphone per earbud is especially effective at reducing low-frequency noise. A possible feeling of pressure on the ears and the slight ANC noise (in very quiet environments) is avoided with this system.
Even when ANC is activated, your headphones' sound quality is always at its best.
If you want to create a quiet space in a noisy environment, you ca n simply use the earbuds as noise protection by using ANC.

Notes on active noise cancellation

• Continuous low-frequency noise, such as motor or fan noise, is particularly well suppressed.
• Speech or high-frequency noise is significantly reduced, but can remain perceptible.
• If unusual (whistling or beeping) noise occurs, take the headphones off and put them on again. Make sure that the earbud s properly fit in your ears and make a good seal with the ear canal.
• To avoid loud, unusual (whistling or beeping) noise and to ensure proper noise cancellation, do not cover the microphone opening s of the active noise cancellation circuitry located on the outside of the ear cups.
• With active noise cancellation ANC activated, the battery life of the earbuds is reduced.

Activating/deactivating the active noise cancellation ANC

• Tap the touch control panel of the left earbud 3x.
  The active noise cancellation ANC is activated or deactivated.
  
  You can also activate or deactivate the active noise cancellation ANC via the Smart Control app.

Listening to ambient sounds or conversations - activating/deactivating the Transparency Mode function
With Transparency Mode activated, you can hear ambient sounds or communicate without having to remove the earbuds from your ears. This allows you to hear e.g. announcements in the train or aircraft or to have short conversations.

• Tap the touch control panel of the left earbud 1x.
  The Transparency Mode set in the Smart Control app is activated. You can hear ambient sounds without having to remove the earbuds from your ears.

To deactivate the Transparency Mode function:

• Tap the touch control panel of the left earbud 1x.

Adjusting the Transparency Mode function
To be able to fully use Transparency Mode, you require the Smart Control app.

• Select the desired Transparency Mode function in the Smart Control app:

*: default setting

Using the voice assistant/voice dialing

• Tap the touch control panel of the right earbud 3x.
  The available voice assistant of your smartphone is activated (*depending on the system or app on your smartphone: Siri, Google Assistant, ...).
• Ask the voice assistant your question or make a request.
  To cancel the voice assistant/voice dialing:
• Tap the touch control panel of the right earbud 3x.
  

Right touch control panel		Function
	Tap 3x	Activates the voice assistant

Using the Smart Pause function
The earbuds automatically detect whether they are worn in the ear or removed from the ear.
Music playback pauses when you remove an earbud from your ear and resumes when you insert it again (if you interrupt for more than 2 minutes, playback will not start automatically).
You can activate (default setting) or deactivate the function via the Smart Control app.

Controlling music playback
The music playback functions are only available when the earbuds and the device are connected via Bluetooth. Some smartphones or music players may not support all functions.

Playing/pausing music

• Tap the touch control panel of the right earbud 1x.

Right touch control panel		Function
	Tap 1x	Plays or pauses music

Playing the previous track

• Tap the touch control panel of the left earbud 2x.
  

Left touch control panel		Function
	Tap 2x	Plays the previous track in the playlist

Playing the next track

• Tap the touch control panel of the right earbud 2x.
  

Right touch control panel		Function
	Tap 2x	Plays the next track in the playlist

Making calls using the earbuds
The call functions are only available when the earbuds and the smartphone are connected via Bluetooth.
Some smartphones and telephony apps (e.g. WhatsApp, Skype, WeChat) may not support all call control functions.
During a call, you can use the right and/or left earbud to control the call functions.

Making a call

• Dial the desired number on your smartphone.
  If your smartphone does not automatically transfer the call to the headphones, select "CX Plus True Wireless" as the audio source on your smartphone (see the instruction manual of your smartphone if necessary).

Accepting/rejecting/ending a call
If your headphones are connected to a smartphone and you receive a call, you hear a ring tone in the headphones.
If you are playing music when you receive a call, the music pauses until you end the call.

Right or left touch control panel		Function
	Tap 1x	Accepts a call
	Tap 1x	Ends a call Voice prompt "Call ended"
	Tap 2x	Rejects a call Voice prompt "Call rejected"
	Tap 1x	Accepts an incoming call and ends the active call
	Tap 2x	Rejects an incoming call and continues the active call

Using the Auto Call function
If you take the paired earbuds out of the charging case during an incoming call, the call is automatically accepted and you can use the earbuds directly for making calls.
You can activate (default setting) or deactivate the function via the Smart Control app. Note that both earbuds must be switched on to adjust the settings for both earbuds (right and left).
The right or left earbud can be used alone. If you insert one earbud into the charging case during use, a short interruption of playback may occur in the other earbud.

Using the Sidetone function
When using the earbuds for phone calls, you may find it more comfortable if your own voice is audible in the earbuds. With the Sidetone function activated, your own voice is played back through the earbuds during a phone call.
You can activate the function (default setting) and adjust settings or deactivate the function via the Smart Control app. Note that both earbuds must be switched on to adjust the settings for both earbuds (right and left).

Displaying the battery charge status
When the earbuds are connected to your Bluetooth device, the battery charge status can be displayed on the screen of your smartphone or device (depending on the device and operating system used).
The Smart Control app also displays the charge status of the earbuds' rechargeable batteries.

Displaying the battery charge status using the charging case

If no USB cable is connected to the charging case:

• Open the lid of the charging case.
  The LED of the charging case displays the battery charge status. If you close the lid of the charging case, the LED will go off after 5 seconds.

LED		Charging case WITH earbuds inserted	Charging case WITHOUT earbuds inserted
	lights up green	... earbuds are fully charged and the charging case can still charge at least one complete cycle	... charging case is fully charged
	pulses yellow	... earbuds are being charged via the rechargeable battery of the charging case	–
	lights up yellow	... earbuds are fully charged, the charging case cannot charge another complete cycle	... charging case is charged less than 90%
	lights up red	... rechargeable batteries of the earbuds and the charging case are empty	... rechargeable battery of the charging case is empty
	flashes red	... a charging error/ battery error has been detected in at least one earbud	... a charging error/ battery error has been detected in the charging case

Adjusting sound effects/the equalizer
To be able to use the sound effects/equalizer, you require the Smart Control app.

• In the Smart Control app, select the desired sound effects via the equalizer. You can use predefined presets or define your own settings.
  The sound effects are stored in the earbuds. These sound settings are active even without using the Smart Control app, i.e. when you are using a different Bluetooth device. Note that both earbuds must be switched on to adjust the settings for both earbuds (right and left).

Setting the voice prompts/beep sounds
To be able to set the voice prompts and beep sounds, you require the Smart Control app.
You can change the language of the voice prompts, choose between voice prompts and beep sounds, or deactivate the status messages with a few exceptions (e.g. rechargeable battery is empty). Note that both earbuds must be switched on to adjust the settings for both earbuds (right and left).

Customizing the control functions
To be able to customize the control functions for music playback, you require the Smart Control app.
The app allows you to customize the control functions and other commands or to select preset control functions. Some basic functions cannot be changed (e.g. call control).

Storing or transporting the earbuds in the charging case
Store the earbuds in the charging case to prevent damage to the earbuds when you are not using them or transporting them. The earbuds are automatically charged in the charging case so you always have the full battery life to work with.

• Open the lid of the charging case by overcoming a slight magnetic resistance and insert the left earbud into the left charging compartment and the right earbud into the right charging compartment.
  The earbuds are magnetically pulled into the charging compartments.
• Close the lid of the charging case.
  

Care and maintenance of the earbuds/charging case

Liquids can damage the electronics of the product!
Liquids entering the housing of the product can cause a short-circuit and damage the electronics.

• Keep all liquids far away from the product.
• Do not use any solvents or cleansing agents.

If the earbuds have gotten wet:

• Remove the ear adapters and dry the earbuds and ear adapters with a dry cloth. If necessary, leave the earbuds and ear adapters dry at room temperature for approx. 12 hours.

Replacing the ear adapters
For reasons of hygiene, you should replace your ear adapters from time to time. Spare ear pads are available from your Sonova Consumer Hearing partner.

1. Pull the ear adapter away from the in-ear sound tunnel.
2. Mount the new ear adapter to the in-ear sound tunnel. Ensure that it locks into place.
   

Information on the built-in rechargeable battery
Sonova Consumer Hearing GmbH ensures and guarantees that the rechargeable batteries perform at their optimum upon purchase of the product. If, upon purchase or within the warranty period, you suspect that a rechargeable battery is obviously defective or if a charging error/battery error is displayed, stop using the product, disconnect it from the power supply system and contact your Sonova Consumer Hearing partner. Your Sonova Consumer Hearing partner will coordinate the repair/replacement with you.
Do not return a product with a defective battery to your dealer or Sonova Consumer Hearing partner unless requested to do so. To find a partner in your country, search at www.sennheiser-hearing.com/service-support

Installing firmware updates
Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app.

• Before updating, the earbuds must be removed from the charging case and must not be placed back into the charging case during the update.
• Connect your earbuds to your smartphone and start the Smart Control app.
• The app provides information on available firmware updates and guides you through the installation process.
• Make sure that the batteries are fully charged before updating. Avoid connecting or disconnecting the USB power supply during the update process.

FAQ/If a problem occurs...

Current list of frequently asked questions (FAQ)
Visit the CX Plus True Wireless product page at www.sennheiser-hearing.com
There you will find a current list of frequently asked questions (FAQ) and suggested solutions.

Your question has not been answered or the problem persists?
If a problem occurs that is not listed in the FAQ section or if the problem cannot be solved with the proposed solutions, please contact your Sonova Consumer Hearing partner for assistance. To find a partner in your country, search at www.sennheiser-hearing.com/service-support

Leaving the Bluetooth transmission range
Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone. The transmission range largely depends on environmental conditions such as wall thickness, wall composition etc. With a free line of sight, the transmission range of most smartphones and Bluetooth devices is up to 10 meters.
If you, and therefore the earbuds, leave the Bluetooth transmission range of the smartphone, the sound quality deteriorates increasingly until you hear the voice prompt "No connection" and the connection breaks down completely. If you immediately re-enter the Bluetooth transmission range, the connection is automatically re-established and you hear the voice prompt "Connected". If this is not the case, tap the touch control panel of the earbud 1x.

Resetting the earbuds
If the function of the earbuds is disturbed, perform a reset. Individual settings such as the pairing settings are not deleted.
Insert both earbuds into the charging case, close the lid of the charging case and wait at least 10 seconds before taking the earbuds out of the charging case and switching them on again.

Resetting the earbuds to the factory default settings
If the function of the earbuds is disturbed and a reset does not improve, reset the earbuds to the factory default settings. This deletes, among other things, all pairing settings.
The easiest way to reset the earbuds to the factory default settings is using the Smart Control app.
Alternatively, you can manually proceed as follows:

1. Deactivate Bluetooth on your smartphone.
   The connection between your smartphone and the CX Plus Tru e Wireless is disconnected.
   
2. Take one earbud out of the charging case, leave the other earbud in the charging case.
   

3. Touch and hold the touch control panel of the earbud that is no tin the charging case for 10 seconds.
   The LED on this earbud alternately lights up green and red.
   
4. Now stop touching the touch control panel.
   
5. Place the earbud back into the charging case. Be sure to leave the lid of the charging case open when doing so.
   After 20 seconds, the earbuds are reset to the factory default settings and automatically reconnect to each other.
   

After the earbuds have been successfully reset and paired with each other, the LED of the charging case lights up red and green 3x.

• To reconnect your earbuds to your smartphone, reactivate Bluetooth on your smartphone.

Pairing a spare earbud with another earbud
The right and the left earbud are paired with each other upon delivery. If, however, you are using a different earbud (e.g. a spare earbud), you have to pair the two earbuds with each other once. This pairing process resets the earbuds to the factory default settings.

1. Insert both earbuds into the charging case and leave the lid of the charging case open.
   
2. After 20 seconds, the earbuds are paired with each other.
   The LED on the charging case then lights up red and green 3x.
   The earbuds are now paired with each other.
   

If you have closed the lid of the charging case too early, repeat the above procedure.
After the pairing process with a spare earbud, all settings are reset. Pair the earbuds with your smartphone again.

Specifications

CX Plus True Wireless CX Plus SE True Wireless
CX 500BT True Wireless
Model: CXPLUSTW1, CXPLUSTW1 C, CXPLUSTW1 L, CXPLUSTW1 R

Wearing style	True Wireless stereo earbuds
Ear coupling	ear-canal
Frequency response	5 Hz to 21 kHz
Transducer principle	dynamic
Transducer size	7 mm
Sound pressure level (SPL)	114 dB (1 kHz/0 dBFS)
THD (1 kHz, 94 dB SPL)	≤ 0.08% (1 kHz, 94 dB)
Noise cancellation	ANC technology with one pick-up microphone
Microphone principle	MEMS
Microphone frequency response	100 Hz to 10 kHz
Microphone pick-up pattern (speech and ANC)	2-microphone beamforming array for active noise cancellation per earbud
Power supply	built-in lithium rechargeable batteries, 3.7 V earbuds: 55 mAh charging case: 400 - 420 mAh USB charging via USB-C socket of the charging case: 5 V , 600 mA
Operating time	8 hrs with rechargeable battery of the earbud 24 hrs with rechargeable battery of the charging case (test conditions: iPhone within 1 m distance, Bluetooth AAC codec, volume level 50%, Transparency Mode off, ANC off, no EQ settings)
Charging time of rechargeable batteries	approx. 1.5 hours for full charge approx. 10 minutes for 1 hour of music playback
Temperature range	operation: 0 to +40°C storage: –20 to +60°C
Relative humidity	operation: 10 to 80%, non condensing storage: 10 to 90 %
Magnetic field strength	earbuds: 0,7 mT charging case: 39 mT
Ingress protection of the earbuds	splash proof (IPX4)
Weight	earbuds: approx. 6 g each charging case: approx. 35 g both earbuds and charging case: 47 g

Bluetooth

Sonova Consumer Hearing GmbH
Am Labor 1
30900 Wedemark Germany
www.sennheiser-hearing.com