Sennheiser BTD 700 USB Bluetooth Adapter
Important Safety Information
Please 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 has obvious defects. Use the product only in locations where wireless Bluetooth communication is permitted.
Preventing Accidents and Health Hazards: Do not use this product near water. Protect the product from rain and moisture to reduce the risk of fire and electric shock. For accident prevention, store the product, accessories, and packaging in a location inaccessible to children and animals. Danger of swallowing and suffocation!
Protecting the Product from Damage and Improper Use: Avoid exposing the product to moisture and extreme temperatures (e.g., hair dryer, heater, prolonged exposure to sunlight) to prevent corrosion and deformation. Normal operating temperatures: 0 to 40° C. If a USB A adapter is used to connect the dongle to a PC/Mac, there is a risk of damage to the protruding part of the dongle and/or the USB port if the dongle is subjected to mechanical stress. To reduce the risk of mechanical stress, use a USB extension cable. Only use accessories and 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 dry, clean place protected from dust.
Information on Data Collection and Processing, and Firmware Updates: This product stores individual settings, such as the Bluetooth address of the paired device. This data is necessary for the product's operation and is not permanently stored or transmitted to Sonova Consumer Hearing GmbH or other authorized companies. With the Sennheiser Dongle Control program, you can update the device's firmware free of charge via an internet connection. If the PC/Mac on which the program is installed is connected to the internet, the following data is automatically transmitted to and processed by Sonova Consumer Hearing servers to provide and deliver suitable firmware updates: the product's article number. This data is used exclusively for providing and transmitting firmware updates and is not stored permanently. If you do not want this data to be transmitted or processed, you should not connect your device to the internet.
Intended Use and Liability: This device is intended for wireless audio transmission between a smartphone or PC/Mac and headphones using wireless Bluetooth technology. Any use of this product for purposes not specified in the relevant documentation is considered improper. Sonova Consumer Hearing GmbH is not liable for damage to devices with incompatible interface characteristics (USB). Sonova Consumer Hearing GmbH is not liable for damage caused by loss of connection due to exceeding the Bluetooth transmission range. Sonova Consumer Hearing GmbH is not liable for damage caused by improper or inappropriate use of this product and its accessories. Before putting the product into operation, study the applicable laws of your country and comply with them.
Package Contents
- Bluetooth USB C Dongle
- USB A Adapter
- Quick Guide
- Safety Guide
- Compliance Sheet
On the website you can find:
- This detailed instruction manual and additional information (www.sennheiser-hearing.com/download)
- The Sennheiser Dongle Control program for updating the product firmware (www.sennheiser-hearing.com/download or www.sennheiser-hearing.com/btd-700)
Product Overview
Dongle with USB A Adapter
1. Pairing Button: Used to start device functions, e.g., the pairing process.
2. USB C Dongle
3. Status LED Indicator: Shows the dongle's operating status.
4. USB C Port
5. USB C Socket
6. USB A Adapter (USB C to USB A)
7. USB A Port
Overview of the LED Indicator on the Dongle Body
The LED indicator on the dongle body shows the dongle's operating status:
| LED Indicator | Dongle Operating Status |
|---|---|
| Flashing red and white | Pairing with headphones in progress |
| Flashing white 3 times | Pairing with headphones successfully completed |
| Flashing white repeatedly in series of 3 for 20 seconds | Searching for paired headphones for a maximum of 20 seconds |
| White and flashing white | Reconnecting with paired headphones |
| Flashing red 3 times | Failed to pair with headphones |
| Dim white | Device connected using Bluetooth Classic mode |
| Dim blue | Device connected using Bluetooth Low Energy mode |
| Solid blue | Audio encoding with LC3 codec |
| Solid pink | Audio encoding with aptX Adaptive or aptX Classic codec |
| Solid purple | Audio encoding with aptX Lossless codec |
| Solid white | Audio encoding with SBC codec |
| Flashing white | Incoming call |
| Flashing pink 3 times | Restoring factory default settings |
| Off | Dongle disconnected from headphones or device |
| Solid red | Audio mute function activated |
| Solid yellow | Auracast™ broadcast mode |
| Solid green | Gaming mode |
Getting Started
1. Connecting the Dongle to a Mobile Device or Computer (PC/Mac)
The dongle is compatible with mobile devices, as well as PC and Mac computers. The dongle can be connected to a USB C port or a USB A port using the included USB A adapter.
No driver installation is required for connecting the device. The dongle is automatically recognized as an external sound card.
Note: The dongle is designed for connection to smartphones or PC/Mac computers. It cannot be used with televisions or devices requiring high-fidelity audio playback.
When connecting the dongle to a mobile device, there is a risk of damage to the protruding part of the dongle and/or the USB port if the dongle is subjected to mechanical stress. To reduce the risk of mechanical stress, connect the dongle to mobile devices using an extension cable.
Connecting the Dongle to a USB C Port
Connect the dongle to the USB C port of your mobile device or PC/Mac.
Diagram: Shows a USB C dongle being plugged into a USB C port on a mobile device or computer.
Connecting the Dongle to a USB A Port
Connect the dongle to the included USB A adapter. Connect the USB A adapter to the USB A port of your PC/Mac.
Diagram: Shows a USB C dongle connected to a USB A adapter, which is then plugged into a USB A port on a computer.
2. Pairing Bluetooth Headphones with the USB Dongle
The dongle is compatible with all Bluetooth headphone models.
Ensure your headphones are ready for pairing (see the headphone instruction manual). After connecting to a mobile device or PC/Mac, the dongle automatically enters pairing mode and searches for Bluetooth headphones to pair with.
When the dongle is in pairing mode, the LED indicator alternately flashes red and white.
If the dongle does not automatically enter pairing mode, manually activate pairing mode by pressing and holding the pairing button for 3 seconds.
Diagram: Shows steps for pairing: 1. Press and hold pairing button for 3 seconds. 2. LED flashes red and white. 3. Headphones with Bluetooth symbol and connection symbol.
After successful pairing, the LED indicator flashes white 3 times.
Note: Upon the first pairing with Bluetooth headphones, the dongle saves the connection profile of these headphones in the pairing list. When the paired dongle is reconnected to a mobile device or PC/Mac, the dongle automatically attempts to reconnect to the paired headphones.
Using the Dongle
Powering the Dongle On and Off
The dongle automatically powers on immediately after being connected to a mobile device or PC/Mac.
Connect the dongle to a mobile device or PC/Mac (see page 7). If the dongle was previously paired with Bluetooth headphones, it will automatically attempt to connect to the last paired headphones. If the dongle was not previously paired with Bluetooth headphones, it will automatically enter pairing mode and search for Bluetooth headphones to pair with.
To turn off the dongle, disconnect it from the USB port of the mobile device or PC/Mac.
Pairing the Dongle with New Bluetooth Headphones
If the dongle was previously paired with Bluetooth headphones and you need to pair it with a different set of headphones, you must manually activate pairing mode. The last saved pairing profile will be overwritten with the pairing profile of the new Bluetooth headphones.
Connect the dongle to a mobile device or PC/Mac (see page 7).
Press and hold the dongle's pairing button for 3 seconds. The dongle will enter pairing mode. The status LED indicator will alternately flash red and white.
Diagram: Shows steps for pairing: 1. Press and hold pairing button for 3 seconds. 2. LED flashes red and white. 3. Headphones with Bluetooth symbol and connection symbol.
After successful pairing, the status LED indicator flashes white 3 times.
Reconnecting Paired Bluetooth Headphones to the Dongle
If the connection between the dongle and the paired Bluetooth headphones is interrupted, you can attempt to re-establish the connection.
Briefly press the dongle's pairing button.
Diagram: Shows a brief press of the pairing button, with the LED flashing white 3 times.
During a connection attempt, the status LED indicator flashes white in series of 3. The connection process may take up to 20 seconds.
Switching Between LC3 and Bluetooth Classic Modes
During audio streaming, you can switch between LC3 and the best available Bluetooth Classic mode. The following priorities apply in descending order: LC3, aptX Adaptive, aptX Lossless, aptX Classic, SBC.
To switch Bluetooth modes, do the following:
Briefly press the pairing button during audio streaming.
If audio encoding with the LC3 codec is active, the status LED indicator will be solid blue.
If audio encoding with the aptX™ Adaptive or aptX™ Classic codec is active, the status LED indicator will be solid pink.
If audio encoding with the aptX™ Lossless codec is active, the status LED indicator will be solid purple.
If audio encoding with the SBC codec is active, the status LED indicator will continuously be solid white.
Muting and Unmuting Audio During a Call
During a call, you can mute or unmute the audio transmission from your side.
To mute the audio transmission from your side during a call, briefly press the pairing button. The red status LED indicator will light up.
To unmute the audio transmission from your side, briefly press the pairing button again. The white status LED indicator will light up.
Diagram: Shows a brief press of the pairing button, with the LED turning red for mute and white for unmute.
Switching to Auracast™ Broadcast Mode
Auracast technology allows audio data to be broadcast simultaneously to multiple output devices, such as your headphones and your friend's headphones.
To switch to Auracast broadcast mode, briefly press the pairing button twice.
Diagram: Shows a double press of the pairing button, with the LED turning yellow.
The yellow status LED indicator will light up.
Switching Back to High-Quality Streaming Mode
To switch back to high-quality streaming mode, briefly press the pairing button twice again.
Switching to Gaming Mode
To switch to gaming mode, briefly press the pairing button 3 times.
Diagram: Shows a triple press of the pairing button, with the LED turning green.
During audio streaming, the status LED indicator will be solid green.
During a call, the status LED indicator will be solid white.
To switch back to high-quality streaming mode, briefly press the pairing button 3 times again.
Switching from Bluetooth Hands-Free Profile (HFP) to Advanced Audio Distribution Profile (A2DP)
To switch from Bluetooth HFP profile to A2DP, briefly press the pairing button 4 times.
Information on Wireless Bluetooth Connection
The dongle is compatible with Bluetooth version 5.4.
If your headphones support one of the following high-resolution audio codecs, you can enjoy high-quality music playback: aptX™ Adaptive (aptX™ HD, aptX™ Lossless). Otherwise, music will be played back with standard quality (SBC). The dongle's status LED indicator shows the audio encoding method used.
If your headphones support aptX™ Low Latency technology, synchronization between audio and image will be automatically optimized when watching videos. This means audio (sound) and video (image) will always be synchronized.
The dongle saves the connection profile of the last paired Bluetooth headphones in the pairing list. After connecting to a mobile device or PC/Mac, the dongle automatically connects to the saved Bluetooth headphones. This way, you can use the dongle and headphones immediately after powering them on, even if you switch to a different computer, for example.
The dongle can only save one connection profile. If you pair the dongle with other Bluetooth headphones, the saved connection profile will be overwritten.
Care and Maintenance
Cleaning the Dongle and Adapter
WARNING! Liquids can damage the electronic components of the product! Liquids that get inside the product's housing can cause short circuits and damage the electronic components. Keep all liquids away from the product. Do not use solvents or cleaning agents. Clean the dongle and adapter only with a soft, dry cloth.
Firmware Updates
Firmware updates can be downloaded free of charge via the Internet using the Sennheiser Dongle Control program: www.sennheiser-hearing.com/btd-700 or www.sennheiser-hearing.com/download.
Questions and Answers / If a Problem Occurs...
If a problem occurs, follow these steps until it is resolved and you can use the dongle again.
- Connect the dongle to the Sennheiser Dongle Control program to install the latest firmware version (see page 13).
- Reset the dongle to factory default settings (see page 15).
- Check the list of frequently asked questions to see if there is a solution to the problem (see page 14).
- To resolve the problem, contact a Sonova Consumer Hearing partner (see page 14).
Current List of Frequently Asked Questions
Visit the BTD 700 product page at www.sennheiser-hearing.com/btd-700. There you can find an up-to-date list of frequently asked questions and suggested solutions.
Is your question not answered or the problem not resolved?
If a problem occurs that is not described in the FAQ section, or if it cannot be resolved using the suggested solutions, please contact your Sonova Consumer Hearing partner. You can find a partner in your country at www.sennheiser-hearing.com/service-support.
Exceeding the Bluetooth Transmission Range
Calls and wireless streaming are only available within the Bluetooth range of your dongle. The transmission range depends significantly on environmental conditions, such as wall thickness, material, etc. With no obstacles in the line of sight, the dongle's transmission range is up to 10 meters.
If you (and therefore your Bluetooth headphones) go out of the dongle's Bluetooth transmission range, the audio quality will progressively worsen until the connection is completely lost. If the connection between the dongle and Bluetooth headphones is interrupted, you can attempt to re-establish the connection (see page 9).
Resetting the Dongle to Factory Default Settings
If the dongle is not functioning correctly, you can reset it to factory default settings. The saved connection profile of the last paired Bluetooth headphones will be deleted from the pairing list.
Press and hold the dongle's pairing button for 10 seconds. After the reset is complete, the status LED indicator will flash pink 3 times.
Diagram: Shows pressing and holding the pairing button for 10 seconds, with the LED flashing pink 3 times.
Technical Specifications
Model: BTD 700
| Key: | Adapter: | |
|---|---|---|
| Dimensions (L x W x H) | Approx. 23.8 x 15.2 x 7.6 mm | Approx. 25.69 x 15.2 x 7.6 mm |
| Weight | Key: Approx. 2.2 g | Adapter: Approx. 3 g |
| USB Interface | USB 2.0 | |
| Power Supply | 5 V, 100 mA | |
| Input Voltage | 4.75 to 5.25 V DC | |
| Operating Current | ≤ 100 mA | |
| Standby Current | < 2.5 mA | |
| Temperature Range | Operation: 0 to +45 °C Storage: -25 to +70 °C | |
| Relative Humidity, non-condensing | Operation / Storage: < 85% | |
| Supported Host Operating Systems | Windows 10 or later Mac OS V11 and V12 Android 13 or later iPhone or iPad with USB C | |
Bluetooth
| Version | Bluetooth 5.4, Class 1 compatible |
| Transmission Frequency | 2.402 to 2.480 MHz |
| Modulation | Gaussian Frequency Shift Keying (GFSK), Differential Quadrature Phase Shift Keying (π/4 DQPSK), Offset Quadrature Phase Shift Keying (8DPSK) |
| Profiles | HFP, A2DP, Auracast™ |
| Output Power | 10 mW (max.) |
| Codec | Qualcomm® aptX™, Qualcomm® aptX™ Adaptive Audio, Qualcomm® aptX™ Lossless, SBC, LC3 |
| Device Name | BTD 700 |
| Range | Up to 50 m |
Manufacturer's Statements
Warranty
Sonova Consumer Hearing GmbH provides a 12-month warranty for this device. You can find the current warranty conditions on the website www.sennheiser-hearing.com/warranty or from Sonova Consumer Hearing partners.
LIMITED WARRANTY FOR REPLACEMENT PARTS AND REPAIR SERVICES
Most products are covered by a two-year limited warranty. For full warranty terms and conditions, as well as a list of products covered by the warranty, see: www.sennheiser-hearing.com/warranty-conditions.
Beyond the terms of the Limited Warranty, Sonova Consumer Hearing GmbH does not provide or guarantee the availability of any spare or replacement parts, repair services, or information necessary for the servicing or repair of products offered for sale by www.sennheiser-hearing.com. Sonova Consumer Hearing GmbH hereby disclaims any implied, statutory, or other warranties or representations regarding their availability.
The product complies with the following regulations:
- General Product Safety Regulation (EU) 2023/988
EU Declaration of Conformity
- RoHS Directive (2011/65/EC)
- Sonova Consumer Hearing GmbH hereby declares that the radio equipment type BTD 700 complies with Directive 2014/53/EC on radio equipment. The full text of the EU declaration of conformity in English is available at: www.sennheiser-hearing.com/download
UK Declaration of Conformity
- RoHS Regulations (2012)
- Radio Equipment Regulations (2017)
Disposal Notes
- EU: WEEE Directive (2012/19/EU)
- UK: WEEE Regulations (2013)
The crossed-out wheeled bin symbol on the product, battery/rechargeable battery (if applicable) and/or packaging indicates that these products must not be disposed of with regular household waste and must be disposed of separately at the end of their service life. Packaging must be disposed of in accordance with the waste sorting regulations applicable in your country. Improper disposal of packaging may harm your health and the environment.
Separate collection of electrical and electronic equipment, batteries/rechargeable batteries (if applicable), and packaging for disposal is used to promote recycling and reuse and to prevent negative impacts on your health and the environment caused by the presence of potentially hazardous substances in these products. Dispose of waste electrical and electronic equipment, as well as batteries and rechargeable batteries, in such a way that the recyclable materials contained therein can be used and environmental pollution is prevented.
You can obtain further information on recycling such products from your local authorities, waste collection points, or your Sonova Consumer Hearing partner. You can also return electrical or electronic equipment to distributors who are committed to taking it back for recycling. In this way, you make a significant contribution to protecting the environment and public health.
Trademarks
Apple, iPhone, the Apple logo, and Siri are trademarks of Apple Inc., registered in the USA and other countries. The iPhone trademark is used in Japan under license from Aiphone K.K.
The Bluetooth® word mark and corresponding logos are registered trademarks of Bluetooth SIG, Inc. The Auracast™ word mark and corresponding logos are trademarks of Bluetooth SIG, Inc. Any use of these by Sonova Consumer Hearing GmbH is under license.
Qualcomm® aptX™ (product of Qualcomm Technologies International, Ltd. Qualcomm) is a trademark of Qualcomm Incorporated, registered in the USA and other countries, used with permission; aptX™ is a trademark of Qualcomm Technologies International, Ltd., registered in the USA and other countries, used with permission.
Other product and company names mentioned in the user documentation may be trademarks or registered trademarks of their respective owners.
