Sennheiser HD 350BT, SEBT3 - Around-ear Headphones 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 brand Sennheiser sound exceptionally good at low and medium volume levels.
• 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 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 or when performing skilled jobs).

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 to 40°C/32 to 104°F.
• Use only attachments/accessories/spare parts supplied or recommended by Sonova Consumer Hearing.
• Clean the product only with a soft, dry cloth.
• Use the product with care and store it in a clean, dust-free environment.

Safety instructions for Lithium 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 and/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/50°F and 104°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).
	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 data collection and processing and on firmware updates

This product stores individual settings such as the volume and the Bluetooth addresses of paired devices. This data is required for the operation of the product and is not transferred to Sonova Consumer Hearing or companies commissioned by Sonova Consumer Hearing 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 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 this 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 into operation, please observe the respective country-specific regulations.

Package contents

Online you can find:

• 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 HD 350BT product page at www.sennheiser-hearing.com. To purchase online or contact your local Sonova Consumer Hearing partner: www.sennheiser-hearing.com/service-support.

Product overview

HD 350BT model: SEBT3

1. Headband
2. Ear cup joints
3. Ear cups, steplessly adjustable
4. On/off button pressing for 4 seconds activates the Bluetooth pairing mode
5. LED
6. USB-C socket for charging
7. Volume – button (volume down)
8. Volume + button (volume up)
9. 3-way multi-function button for music and call functions
10. Voice assistant button
11. Ear pads
12. Speech microphones (2 pcs.) for phone calls

Overview of the LED display

During operation

LED		Meaning; the headphones
3x	flashes blue 3x	switch on
3x	flashes blue 3x	are connected to a device via Bluetooth
	flashes red/ blue	are in Bluetooth pairing mode
3x	flashes red 3x	are not connected to a device via Bluetooth or the connection has been lost

During phone calls

LED		Meaning
	flashes blue	Incoming call
	flashes red	Incoming call and the rechargeable battery of the headphones is almost empty

If the LED does not light up immediately during charging, clean the charging socket and charge the headphones until the LED lights up again (> 11).

Notes on voice prompts

The headphones output voice prompts for various functions (see examples below).

Voice prompt	Meaning/headphones
"Power on"	are switched on
"Power off"	are switched off
"Connected"	are connected via Bluetooth
"Lost connection"	are not connected via Bluetooth
"Call rejected"	incoming call rejected
"Call ended"	call ended
"More than xx hours playtime"	Rechargeable battery has the stated charge level
"Recharge headset"	Rechargeable battery is empty. Recharge the headphones.

Notes on beeps/acoustic signals

The headphones output beeps/acoustic signals for the following functions.

Acoustic signal	Meaning/headphones...
2x low-pitched beep	minimum volume is reached
2x high-pitched beep	maximum volume is reached

Getting started

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 (> 11).

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 (> 15).

Connecting the headphones to a Bluetooth device

Connect the headphones to your smartphone via Bluetooth (> 12).

Putting the headphones on and adjusting the headband

For good sound quality and best possible wearing comfort, the headband can be adjusted to properly fit your head (> 17).

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 up to 2 hours. Before using the headphones 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 (> 7). Once the headphones are fully charged, the LED flashes blue for 5 minutes and then goes off. When the battery charge drops to a critical level, a voice prompt asks you to recharge the headphones ("Recharge headset").
Sonova Consumer Hearing recommends using the supplied USB cable and a compatible standard USB power supply for charging the headphones.
While the headphones are being charged, you can still listen to music or make phone calls. In this case, however, the charging time may be longer.

Charging the headphones' rechargeable battery

1. Connect the USB-C connector of the charging cable to the US Bsocket 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 US B power source is connected to the power supply system. The charging process of the headphones begins. The LED displays the charge status:

LED		Meaning
	lights up red	Rechargeable battery is being charged
LED Off	flashes blue for 5 minutes, the LED then goes off	Rechargeable battery is fully charged

If the LED does not light up immediately during charging, clean the charging socket and charge the headphones until the LED lights up again (> 11).

You can speed up the charging process by charging the headphones when they are switched off.

Connecting the headphones to a Bluetooth device

To be able to use the Bluetooth connection, you must register both devices (headphones and e.g. smartphone) once. 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 headphones for the first time, they automatically switch to pairing mode.

Information on the Bluetooth wireless connection

Paired and connected Bluetooth device

Paired Bluetooth device (currently not connected)

The headphones are compatible with Bluetooth 5.0.
If your audio source supports one of the following high-resolution audio encoding methods, music is automatically played in high audio quality: aptX, aptX LL 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.
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. Audio playback is only possible from one device at a time.
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.

Pairing the headphones with a Bluetooth device

1. Switch the headphones off and place them close to the Bluetooth device (max. 20 cm).
   
2. Press and hold the on/off button for 4 seconds. The LED flashes red and blue. The headphones are in pairin g 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 "HD 350BT". I fnecessary, enter the default pin code "0000".
   
6. If pairing was successful, you hear the voice prompt "Connected".The LED flashes blue 3x.

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

If you switch on the headphones for the first time (the pairing list is empty), they automatically switch to pairing mode.

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 switch to standby mode.

To delete the Bluetooth pairing list of the headphones, > 27.

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 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 headphones via Bluetooth (> 12).
• Start the Smart Control app.
• Follow the instructions in the app.
  The Smart Control app recognizes the headphones and activates all available settings and functions.

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 (> 19).
• Do not continuously expose yourself to high volume levels.

1. Unfold both ear cups. The joints click into place.
   
2. Press and hold the on/off button for 2 seconds.
   

The LED flashes blue 3x. You hear the voice prompt "Power on". If Bluetooth is activated on the headphones and a paired device i s available, the LED flashes blue 3x and you hear the voice prompt "Connected".

Make sure that Bluetooth is already activated on your Blue tooth 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 3x. The headphones switch to standby mode.

Switching the headphones off

1. Press and hold the on/off button for 2 seconds.
   
2. You hear the voice prompt "Power off" and the LED flashes red 3x. The headphones switch off.
   

Putting the headphones on and adjusting the headband

For good sound quality and best possible wearing comfort, the headband can be adjusted to properly fit your head.

• Wear the headphones so that the headband runs over the top of your head. The markings R for the right side and L for the left side can be found on the inside of the headband.
• Move the ear cups up or down the headband slider until:
  • your ears are comfortably covered by the ear pads,
  • you feel even, gentle pressure around your ears,
  • a snug fit of the headband on the head is ensured.
    For optimal sound quality, the ear pads must completely surroun d your ears.

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). The Smart Control app also displays the battery charge status.
You can retrieve information on the battery charge status on the headphones by pressing the center of the volume button 1x.

Voice prompt	Meaning
"Recharge headset"	The rechargeable battery is empty. Recharge the rechargeable battery (>11).
"More than xx hours playtime"	The remaining battery charge is displayed in hours.

Adjusting the volume

Danger of hearing damage due to high volume levels!
Listening at high volume levels can lead to permanent hearing defects. Toggling between the audio sources may cause enormous volume jumps that can permanently damage your hearing.

• 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 playback volume for music and for phone calls.

You can also adjust the volume using the connected Bluetooth device.

• If you are playing music or are on a call: Press the rear part or the front part of the volume button to increase or reduce the volume for music and phone calls.

When the maximum or minimum volume is reached, you hear a beep.

Controlling music playback

The following 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 center of the 3-way multi-function button 1x.

3-way multi-function button		Function
	Press 1x	Plays or pauses music

Playing the next track

• Slide the 3-way multi-function button backwards.

3-way multi-function button		Function
	Slide backwards	Plays the next track in the playlist

Playing the previous track

• Slide the 3-way multi-function button forwards.

3-way multi-function button		Function
	Slide forwards	Plays the previous track in the playlist

Making phone calls using the headphones

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

Making a call

• Dial the desired number on your smartphone.
  If your smartphone does not automatically transfer the call to the headphones, select "HD 350BT" as the output device on you r smartphone (see the instruction manual of your smartphone i f 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.

3-way 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 2x	Redialing Voice prompt "Redial" (only when music playback is NOT active)
	Hold for 2 sec	Continues the active call and rejects an incoming call
	Press 1x	Puts the active call on hold and accepts an incoming call
	Press 2x	Ends the active call and accepts an incoming call
	Press 2x	Toggles between active call and call on hold

Using the voice assistant/voice dialing

• Press the voice assistant button 1x.
  The available voice assistant of your smartphone is activated (depending on the system or app on your smartphone: Siri, Google Assistant, or others. If no voice assistant is available, voice dialing may be activated).
• Ask the voice assistant your question or make a request.

To cancel the voice assistant/voice dialing:

• Press the voice assistant button 1x.

Adjusting sound effects/the equalizer

To be able to use the sound effects/equalizer, you require the Smart Control app (> 15).

• In the Smart Control app, select the desired sound effects.
  The sound effects are stored in the headphones. These sound settings are active even without using the Smart Control app, i.e. when you are using another Bluetooth device.

Storing and transporting the headphones

• Fold up the headphones.

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 parts of the product only with a soft, dry cloth.

Replacing the ear pads

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

1. Peel the ear pad up and away from the ear cup.
2. Assign the right ear pad to the right ear cup and the left ear pa dto the left ear cup.
3. Place the new ear pad onto the ear cup. Make sure that the sea mof the ear pad points downwards.
4. Place the ear pad around the ear cup so that the ear pad is fixe din the notch of the ear cup.

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 (> 7), 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).

At the end of its operational lifetime, this product with its built-in rechargeable battery must be disposed of separately from normal household waste. You can find more information here: > 29.

Installing firmware updates

Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app. Sonova Consumer Hearing recommends to always install the latest firmware version to ensure the best performance of your product.

• Connect the headphones to your smartphone and start the Smart Control app (> 15).
• The app provides information on available firmware updates and guides you through the installation process.

FAQ/If a problem occurs...

Current list of frequently asked questions (FAQ) Visit the HD 350BT product page at www.sennheiser-hearing.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 Sonova Consumer Hearing partner for assistance.

To find a Sonova Consumer Hearing 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 headphones, leave the Bluetooth transmission range of the smartphone, the sound quality deteriorates 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 automatically re-established.

Resetting the headphones
If the function of the headphones is disturbed, perform a reset. Individual settings such as the pairing settings are not deleted.

1. Connect the USB-C cable to the headphones and make sure tha tthe headphones are being charged (> 11).
   
2. Simultaneously press and hold the one/off button and the rear part of the volume button (Volume +) for at least 5 seconds. The reset is completed. Continue to use the headphones as normal.
   

Deleting the Bluetooth pairing list of the headphones

1. Switch off the headphones (press and hold the on/off button for 2 seconds) and then start pairing mode (press and hold the on/of f button for 4 seconds) (> 17 and 14).
   
   
2. Simultaneously press and hold the on/off button and the 3-way multi-function button for 3 seconds.
   
   The LED on the headphones flashes purple 3x. The pairing list is deleted. The headphones then stay in Bluetooth pairing mode.

Specifications

Model: SEBT3

Wearing style	Bluetooth® around-ear, closed-back
Ear coupling	circum-aural
Transducer principle	dynamic
Transducer	32 mm
Frequency response	18 Hz to 22,000 Hz (-10 dB)
Sound pressure level (SPL)	108 dB (1 kHz/0 dBFS)
THD (1 kHz, 100 dB SPL)	< 0.3% (1 kHz, 100 dB SPL)
Microphone principle	MEMS
Microphone frequency response	80 Hz to 6,000 Hz (-3 dB)
Microphone pick-up pattern dual omni-directional microphones (speech audio)	dual omni-directional microphones 2-mic beamforming array
Power supply	built-in rechargeable lithium-polymer battery: 3.7 V , 300 mAh USB charging: 5 V , 320 mA max.
Charging time of rechargeable battery	up to 2 hrs
Operating time	30 hrs (music playback via Bluetooth)
Temperature range	operation: 0°C to +40°C charging: +10°C to +40°C storage: –20°C to +60°C
Relative humidity	operation: 10 to 80%, non condensing storage: 10 to 90 %
Weight (headphones)	approx. 238 g
Magnetic field strength	1.9 mT

Bluetooth

Version	Bluetooth 5.0 compatible, class 1, BLE
Transmission frequency	2,402 MHz to 2,480 MHz
Modulation	GFSK, π/4 DQPSK, 8DPSK
Output power	12.6 mW (max)
Profiles	HSP, HFP, AVRCP, A2DP
Codec	aptX, aptX LL, AAC, SBC
Device name	HD 350BT LE-HD 350BT (Bluetooth Low Energy only)
Number of active connections	2

Manufacturer Declarations

Sonova Consumer Hearing GmbH gives a warranty of 24 months on this product.

For the current warranty conditions, please visit our website at www.sennheiser-hearing.com/warranty or contact your Sonova Consumer Hearing partner.

In compliance with the following requirements

• General Product Safety Directive (2001/95/EC)
• Compliant to Sound Pressure Limits according to country specific requirements

EU declaration of conformity

• RoHS Directive (2011/65/EU)
  Hereby, Sonova Consumer Hearing GmbH declares that the radio equipment type SEBT3 is in compliance with the Radio Equipment Directive (2014/53/EU).
  The full text of the EU declaration of conformity is available at the following Internet address: www.sennheiser-hearing.com/download.

UK declaration of conformity

• RoHS Directive (2012)
• Radio Equipment Regulations (2017)

Notes on disposal

• EU: Battery Directive (2006/66/EC & 2013/56/EU)
• EU: WEEE Directive (2012/19/EU)
• UK: Battery Regulations (2015)
• UK: WEEE Regulations (2013)

The symbol of the crossed-out wheeled bin on the product, the battery/rechargeable battery (if applicable) and/or the packaging indicates that these products must not be disposed of with normal household waste, but must be disposed of separately at the end of their operational lifetime. For packaging disposal, observe the legal regulations on waste segregation applicable in your country. Improper disposal of packaging materials can harm your health and the environment.
The separate collection of waste electrical and electronic equipment, batteries/rechargeable batteries (if applicable) and packagings is used to promote the reuse and recycling and to prevent negative effects on your health and the environment, e.g. caused by potentially hazardous substances contained in these products. Recycle electrical and electronic equipment and batteries/rechargeable batteries at the end of their operational lifetime in order to make contained recyclable materials usable and to avoid littering the environment.

Documents / Resources

References

• Smart Control App | Sennheiser
• Official website and online shop | Sennheiser
• Service & Support | Sennheiser
• App Store - Apple
• Google Play
• Download | Sennheiser
• 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 HD 350BT, SEBT3 - Around-ear Headphones Manual