1. Introduction
Thank you for choosing the FONENG BL39 Wireless Air Conduction Neckband Headset. This manual provides essential information for setting up, operating, and maintaining your new headset. Please read it thoroughly before use to ensure optimal performance and longevity of your device.
2. Product Overview
2.1 Key Features
- Wireless Bluetooth 5.3 Technology: Enjoy seamless and stable connectivity with the latest Bluetooth 5.3 technology.
- Air Conduction Design: Innovative air conduction technology delivers high-quality sound without blocking your ears, ensuring comfort and awareness of surroundings.
- Neckband Style: Comfortable and secure neckband design ideal for sports and active lifestyles.
- Type C Charging: Fast and efficient charging with universal Type C USB connectivity.
- Lightweight and Durable: Designed for durability and long-term use while remaining lightweight.
- Sweat and Water-Resistant: Perfect for workouts and outdoor activities with features that resist sweat and water.
- Long Battery Life: Extended battery life ensures you stay connected and entertained for longer periods, offering up to 7 hours of music time.
- Ergonomic Fit: Comfortable fit for prolonged use, designed to stay in place during movement.
2.2 Package Contents
Please check the package for the following items:
- FONENG BL39 Air Conduction Headset
- Type-C Power Cable
- User Manual (this document)
2.3 Product Diagram

Figure 1: Front view of the FONENG BL39 headset, showcasing its beige color and neckband design.

Figure 2: Packaging of the FONENG BL39 headset, displaying key features and technical specifications on the back.

Figure 3: Illustration of the air conduction technology, highlighting that no in-ear wear is required, ensuring comfort and preventing ear discomfort.
3. Setup
3.1 Charging the Headset
- Connect the provided Type-C charging cable to the charging port on the headset.
- Connect the other end of the cable to a USB power adapter (not included) or a computer's USB port.
- The indicator light will show the charging status (e.g., red for charging, blue for fully charged).
- A full charge takes approximately 1.5 hours.
3.2 Pairing with Your Device
- Ensure the headset is fully charged before first use.
- With the headset powered off, press and hold the multi-function button until the indicator light flashes red and blue alternately, indicating it is in pairing mode.
- On your smartphone or Bluetooth-enabled device, go to the Bluetooth settings and turn on Bluetooth.
- Search for available devices. You should see "FONENG BL39" in the list.
- Select "FONENG BL39" to connect. Once connected, the indicator light will turn solid blue or flash slowly.
- The headset has a Bluetooth distance of up to 10 meters (33 feet) in an open environment.
4. Operating Instructions
4.1 Power On/Off
- Power On: Press and hold the multi-function button for approximately 3 seconds until you hear a power-on prompt and the indicator light turns on.
- Power Off: Press and hold the multi-function button for approximately 5 seconds until you hear a power-off prompt and the indicator light turns off.
4.2 Music Playback
- Play/Pause: Short press the multi-function button.
- Next Track: Double-press the multi-function button.
- Previous Track: Triple-press the multi-function button.
4.3 Call Management
- Answer/End Call: Short press the multi-function button.
- Reject Call: Press and hold the multi-function button for 2 seconds.
4.4 Wearing the Headset

Figure 4: Proper way to wear the FONENG BL39 neckband headset, ensuring a secure and comfortable fit for active use.
Place the neckband behind your neck, with the ear hooks resting comfortably over your ears. The air conduction speakers should sit just outside your ear canals. The flexible design allows for adaptation to different head sizes and can be twisted without deforming.

Figure 5: The 360-degree flexibility of the FONENG BL39 headset, illustrating its ability to bend and twist without deforming, ensuring durability and adaptability.
5. Maintenance
5.1 Cleaning and Care
- Wipe the headset with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- While the headset is sweat and water-resistant, avoid submerging it in water or exposing it to excessive moisture for prolonged periods.
- Keep the charging port clean and free of dust or debris.
5.2 Storage
- Store the headset in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the headset at least once every three months to maintain battery health.
6. Troubleshooting
6.1 Common Issues and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Headset does not power on | Low battery | Charge the headset fully. |
| Cannot pair with device | Headset not in pairing mode / Bluetooth off on device / Device too far | Ensure headset is in pairing mode (flashing red/blue). Turn on Bluetooth on your device. Move device closer to headset (within 10m). |
| No sound | Volume too low / Not connected / Incorrect audio output | Increase volume on both headset and device. Re-pair the headset. Check audio output settings on your device. |
| Poor sound quality | Interference / Device too far / Low battery | Move away from sources of interference. Move device closer. Charge the headset. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | FONENG BL39 Air conduction headset |
| Bluetooth Version | Bluetooth V5.3 (Chip: BluetrumAB5616B) |
| Bluetooth Audio Protocols | HFP, HSP, A2DP, AVRCP, PBAP |
| Bluetooth Distance | 10m |
| Charging Port | TYPE-C |
| Music Time | 7 hours |
| Battery Capacity | 3.7V, 80mAh |
| Charging Time | 1.5 hours |
| Colour | Beige (also available in Black) |
| Form Factor | On Ear (Air Conduction) |
| Material | ABS |
| Special Features | Air conduction headset, Microphone Included |
8. Warranty and Support
8.1 Manufacturer's Warranty
This product comes with a 1-year manufacturer's warranty. Please retain your proof of purchase for warranty claims. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
8.2 Customer Support
For any questions, technical support, or warranty inquiries, please contact the retailer or the manufacturer directly through their official channels. Refer to the product packaging or the retailer's website for specific contact information.