1. Introduction
Thank you for choosing the Select Sound BTH21-DW Carbon Wireless Headphones. This manual provides essential information for the proper setup, operation, and maintenance of your device. Please read it thoroughly before use to ensure optimal performance and longevity of your headphones.
Figure 1: Front view of the Select Sound BTH21-DW Carbon Wireless Headphones.
2. Product Overview
2.1 Package Contents
- Select Sound BTH21-DW Carbon Wireless Headphones
- USB Charging Cable
- Audio Cable (3.5mm)
- User Manual
2.2 Headphone Components
Familiarize yourself with the various parts and controls of your headphones:
Figure 2: Close-up view of the control buttons and charging port on the earcup.
- Power/Multi-function Button: Power on/off, play/pause, answer/end calls.
- Volume Up/Next Track Button: Short press for volume up, long press for next track.
- Volume Down/Previous Track Button: Short press for volume down, long press for previous track.
- ANC Button: Activate/deactivate Active Noise Cancellation.
- USB-C Charging Port: For charging the headphones.
- 3.5mm Audio Jack: For wired connection.
- Microphone: For hands-free calls.
- LED Indicator: Displays power, pairing, and charging status.
3. Setup
3.1 Charging the Headphones
Before first use, fully charge the headphones. Connect the provided USB charging cable to the USB-C port on the headphones and the other end to a USB power source (e.g., computer, wall adapter). The LED indicator will show charging status and turn off or change color when fully charged.
3.2 Bluetooth Pairing
To connect your headphones wirelessly:
- Ensure the headphones are turned off.
- Press and hold the Power/Multi-function Button for approximately 5-7 seconds until the LED indicator flashes blue and red alternately, indicating pairing mode.
- On your device (smartphone, tablet, laptop), enable Bluetooth and search for available devices.
- Select "Select Sound BTH21-DW" or "Carbon" from the list of found devices.
- Once connected, the LED indicator will flash blue slowly or remain solid blue.
The headphones will automatically attempt to reconnect to the last paired device when powered on.
Figure 3: User demonstrating the comfortable fit of the headphones.
4. Operating Instructions
4.1 Power On/Off
- Power On: Press and hold the Power/Multi-function Button for 3 seconds.
- Power Off: Press and hold the Power/Multi-function Button for 3 seconds.
4.2 Music Playback
- Play/Pause: Short press the Power/Multi-function Button.
- Volume Up: Short press the Volume Up button.
- Volume Down: Short press the Volume Down button.
- Next Track: Long press the Volume Up button.
- Previous Track: Long press the Volume Down button.
4.3 Call Management
- Answer Call: Short press the Power/Multi-function Button.
- End Call: Short press the Power/Multi-function Button during a call.
- Reject Call: Long press the Power/Multi-function Button when a call comes in.
4.4 Active Noise Cancellation (ANC)
Press the dedicated ANC Button to activate or deactivate the Active Noise Cancellation feature. This feature reduces ambient noise for a more immersive listening experience.
4.5 Voice Assistant
If supported by your connected device, a long press on the Power/Multi-function Button (when not on a call or in pairing mode) may activate your device's voice assistant (e.g., Siri, Google Assistant).
5. Maintenance
- Clean the headphones with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid exposing the headphones to extreme temperatures, humidity, or direct sunlight.
- Store the headphones in a cool, dry place when not in use. The headphones feature a foldable design for compact storage.
- Do not attempt to disassemble or modify the headphones, as this will void the warranty and may cause damage.
Figure 4: The headphones can be folded for convenient storage and portability.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Headphones do not power on. | Low battery. | Charge the headphones fully. |
| Cannot pair with device. | Headphones not in pairing mode; Bluetooth disabled on device; device too far. | Ensure headphones are in pairing mode (flashing red/blue). Enable Bluetooth on your device. Move device closer to headphones (within 10m). |
| No sound or poor sound quality. | Volume too low; headphones not properly connected; audio source issue. | Adjust volume on headphones and device. Re-pair headphones. Test with a different audio source. |
| ANC not working effectively. | ANC not activated; specific types of noise. | Press the ANC button to activate. ANC is most effective against low-frequency, constant noise. |
7. Specifications
| Feature | Specification |
|---|---|
| Model Name | Carbon (BTH21-DW) |
| Connectivity Technology | Wireless (Bluetooth) |
| Wireless Communication Technology | Bluetooth |
| Bluetooth Range | Up to 10 meters |
| Noise Control | Active Noise Cancellation (ANC) |
| Frequency Response | 20 MHz |
| Impedance | 140 Ohm |
| Control Method | Touch, Voice |
| Microphone | Integrated for hands-free calls |
| Power Source | Battery (Rechargeable) |
| Material | Plastic |
| Dimensions | 18 x 7 x 16 cm |
| Weight | 570 g |
| Compatible Devices | Cell phones, Tablets, Desktops, Laptops, Television, Car audio systems, Smart speakers |
8. Warranty and Support
For warranty information and customer support, please refer to the warranty card included in your product packaging or visit the official Select Sound website. Keep your purchase receipt as proof of purchase for any warranty claims.
For further assistance, you may contact Select Sound customer service through their official channels.
