Sennheiser CX 150BT, SEBT2 - In-Ear Wireless Manual

Package contents

	Earphones
	USB charging cable with USB-C and USB-A connector
	Silicone ear adapter set in the following sizes: XS, S, M (pre-mounted upon delivery) and L
	Quick guide
	Quick guide

Online you can find:

• this detailed instruction manual and additional information (www.sennheiser.com/download)
• the Sennheiser Smart Control app for getting to know the headphones (www.sennheiser.com/smartcontrol)

You can find a list of accessories on the CX 150BT product page at www.sennheiser.com.
Contact your local Sennheiser partner: www.sennheiser.com > "Service & Support".

Product overview

Headphones

CX 150BT
Model: SEBT2

1. Earphones
2. LED
3. Volume + button (volume up)
4. Multi-function button
5. Volume - button (volume down)
6. USB-C socket for charging the rechargeable battery
7. Cover for USB-C socket
8. Microphone

Overview of the LED indications of the headphones

LED		Meaning; the headphones
	lights up red	are being charged
	lights up blue	are fully charged
	flashes blue	are switched on
	flashes red-blue approx. 1 min	are in Bluetooth pairing mode
	flashes blue	Bluetooth pairing successful
	flashes red	Bluetooth pairing failed
	flashes blue	are connected to a device via Bluetooth
	pulses red approx. 3 sec	are not connected to a device via Bluetooth or the connection has been lost
	flashes red	rechargeable battery is almost empty
	flashes red	are switched off

If the LED does not light up immediately during charging, clean the charging socket and charge the headphones until the LED lights up again (> 9).

Notes on voice prompts

The headphones output voice prompts for the following functions. 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).

"Power on" are switched on "Power off" are switched off "Device (1) (2) connected" are connected to device 1 or 2 "Lost connection" are not connected via Bluetooth "Pairing" are in Bluetooth pairing mode

Getting started

1. Charging the rechargeable battery
   The headphones' rechargeable battery is not fully charged upon delivery. Before using the headphones for the first time, charge the rechargeable battery for a complete charging cycle without interruption (> 9).
   
2. Connecting the headphones to a Bluetooth device
   Connect the headphones to your smartphone via Bluetooth (> 10).
   
3. Selecting suitable ear adapters for optimum fit of the headphones
   
   The perceived sound quality and bass performance depends to a large extent on the correct fit of the headphones 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.
  The ear adapters must fit snugly in the ear canal and completely seal your ears (> 12).

Using the headphones

Information on the rechargeable battery and the charging process

The headphones have a built-in rechargeable battery. A complete charging cycle takes approx. 1.5 hours. Before using the headphone s for the first time, charge the rechargeable battery for a complete charging cycle without interruption.

When the headphones are being charged, the LED lights up (> 6). When the battery charge drops to a critical level, a voice prompt ask s you to recharge the headphones ("Recharge headset").

Sennheiser recommends using the supplied USB cable and a compatible standard USB power supply for charging the headphones.

Charging the headphones' rechargeable battery

1. Connect the USB-C connector of the USB cable to the USB-C socket of the headphones.
2. Connect the USB-A connector to a corresponding socket of a USB power source (to be ordered separately). Make sure that the USB power source is connected to the power supply system. The charging process of the headphones begins. The LED displays the charge status:
   

LED		Meaning
	flashes red	Rechargeable battery is being charged (charge level is very low)
	lights up red	Rechargeable battery is being charged (charge level approx. 50%)
	lights up purple	Rechargeable battery is being charged (charge level approx. 75%)
	lights up blue	Rechargeable battery is fully charged

Connecting the headphones to a Bluetooth device

To be able to use the Bluetooth wireless connection, you must register both devices (headphones 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.

If you switch on the headphones for the first time, they automatically switch to pairing mode.

Information on the Bluetooth wireless connection

The headphones are compatible with Bluetooth 5.0.

If your audio source supports AAC audio encoding, music is automatically played in high audio quality: 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.

On switch-on, the headphones automatically try to connect to the last two connected Bluetooth devices. The headphones can save the connection profiles of up to eight Bluetooth devices with which they have been paired.

If you pair the headphones with the ninth 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 headphones again.

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

Pairing the headphones with a Bluetooth device

1. Switch the headphones on (> 13) and place them close to the Bluetooth device (max. 20 cm).
   
2. Press and hold the multi-function button for 5 seconds until you hear the voice prompt "Pairing".
   The LED flashes blue and red. The headphones 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 Bluetooth device are displayed.
5. From the list of found Bluetooth devices, select "CX 150BT". If necessary, enter the default pin code "0000".
   If pairing was successful, you hear the voice prompts "Pairing successful" and "Device (1) connected". The LED flashes blue 3 times.

If no connection is established within 5 minutes, pairing mode is terminated and the headphones switch to idle mode. If necessary, repeat the steps described above.

Disconnecting the headphones from a Bluetooth device

• Via the menu of your Bluetooth device, disconnect the connection to the headphones.
  The headphones are disconnected from the Bluetooth device. You hear the voice prompt "Lost connection". The headphone s then search for other paired devices. If no device is found within 5 minutes, the headphones switch to idle mode.

Installing the Smart Control app

The Smart Control app allows you to get to know your headphones even better.

Download the app from the 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.com/smartcontrol

• Connect your smartphone to the headphones via Bluetooth (> 10).
• Start the Smart Control app.
• Follow the instructions in the app.
  
  
  
  
  

Selecting suitable ear adapters for optimum fit of the headphones

The perceived sound quality and bass performance of the headphones depends to a large extent on their correct fit 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 earphones into the ears

• Put the cable around your neck.
• Assign the right earphone to your right ear and the left earphone to your left ear.
• Press the earphones lightly into the ear canal.

If the earphones fit too loose in the ear canal and fall out easily:

• Try larger ear adapters.

If you feel immediate pressure when wearing the earphones:

• Try smaller ear adapters.

Switching the headphones 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 (> 15).
• Do not continuously expose yourself to high volume levels.
• Press the multi-function button for 3 seconds.
  The headphones switch on. You hear the voice prompt "Power on" and the LED display flashes blue 3 times.
  If a paired Bluetooth device is within the transmission range, yo u hear the voice prompt "Device (1) connected". The LED flashe s blue 3 times.
  

Make sure that Bluetooth is already activated on your Bluetooth device when switching on the headphones.

If Bluetooth is activated and the headphones cannot find a paired Bluetooth device within a few minutes, you hear the voice prompt "Lost connection". The LED flashes red. The headphones switch to standby mode.

Switching the headphones off

• Press the multi-function button for 3 seconds.
  You hear the voice prompt "Power off" and the LED flashes red 3 times.
  

The headphones automatically switch to idle mode if no paired Bluetooth device can be found within 5 minutes. You can wake up the headphones from idle mode by pressing the multi-function button for approx. 3 seconds.

Retrieving information on the battery charge status

When the headphones are connected to your Bluetooth device, the battery charge status can be displayed on the screen of your smartphone (depending on the device and operating system used).

You can check the battery charge level of your headphones manuall y by pressing the volume - button once. You hear the voice prompt "More than xx % battery left".

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.

You can adjust the volume for music, voice prompts, and phone calls.

• If you are playing music or are on a call: Press the volume + or button to increase or reduce the volume.
  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.

Controlling the music playback

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

• Playing/pausing music
  Press the multi-function button once.

Multi-function button		Function
	Press 1x	Plays or pauses music

• Playing the next track
  Quickly press the multi-function twice.

Multi-function button		Function
	Press 2x	Plays the next track in the playlist

• Playing the previous track
  Quickly press the multi-function three times.

Multi-function button		Function
	Press 3x	Plays the previous track in the playlist

Making phone calls using the headphones

The call functions are only available when the headphones and the smartphone are connected via Bluetooth. Some smartphones may not support all functions.

The multi-function button allows you 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 150BT" 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.
  

Multi-function button		Function
	Press 1x	Accepts a call
	Press 1x	Ends a call Voice prompt "Call ended"
	Hold for 2 sec	Rejects a call Voice prompt "Call rejected"
	Press 1x	Accepts an incoming call and ends the active call
	Press 2x	Puts the active call on hold and accepts an incoming call
	Press 2x	Toggles between active call and call on hold

• Muting the microphone
  To mute the headphones' microphone during a call:
  • Press the volume - button for 2 seconds.
    The microphone is muted. You hear the voice prompt "Mute on".
    

To continue the call and reactivate the microphone:

• Press the volume - button for 2 seconds.
  The microphone is reactivated. You hear the voice prompt "Mute off".

Care and maintenance

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.
• Clean the product only with a soft, dry cloth.
  

Replacing the ear adapters

For reasons of hygiene, you should replace your ear adapters from time to time. Spare ear adapters are available from your Sennheiser 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

Sennheiser ensures and guarantees that the rechargeable battery performs at its optimum upon purchase of the product. If, upon purchase or within the warranty period, you suspect that the rechargeable battery is obviously defective or if a charging error/battery error is displayed (> 6), stop using the product, disconnect it from the power supply system and contact your Sennheiser partner. Your Sennheiser partner will coordinate the repair/replacement with you.

Do not return a product with a defective battery to your dealer or Sennheiser partner unless requested to do so. To find a Sennheiser partner in your country, search at www.sennheiser.com/servicesupport.

FAQ/If a problem occurs...

• Current list of frequently asked questions (FAQ)
  
  Visit the CX 150BT product page at www.sennheiser.com/download
  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 Sennheiser partner for assistance.
  To find a Sennheiser partner in your country, search at www.sennheiser.com > "Service & Support".
• Leaving the Bluetooth transmission range
  Wireless calling and streaming are only possible in the Bluetoot h 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 headphones, leave the Bluetooth transmission range of the smartphone, the sound quality deteriorate s increasingly until you hear the voice prompt "Lost connection" and the connection breaks down completely. If you immediately re-enter the Bluetooth transmission range, the connection is automaticall y re-established.
• Deleting the Bluetooth pairing list of the headphones

1. Switch the headphones on (> 13).
2. Press and hold the multi-function button for 3 seconds. The headphones are in Bluetooth pairing mode. The LED flashes blue and red.
3. Press and hold the volume + button for approx. 3 seconds. The Bluetooth pairing list is deleted. You hear the voice prompt "Pairing list cleared". The LED flashes blue and red three times. The headphones then stay in Bluetooth pairing mode.

Specifications

CX 150BT
Model: SEBT2

Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com

Documents / Resources

References

• Sennheiser — Headphones, Microphones, Wireless Systems - Sennheiser
• Sennheiser
• Sennheiser
• App Store - Apple
• Google Play
• Sennheiser

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Sennheiser CX 150BT, SEBT2 - In-Ear Wireless Manual