Introduction
Thank you for purchasing the VIVO B39 Wireless Bluetooth Head mounted Headphones. This manual provides detailed instructions on how to set up, operate, maintain, and troubleshoot your headphones. Please read this manual carefully before use to ensure optimal performance and longevity of your device.

Figure 1: VIVO B39 Headphones, highlighting features like HD Microphone, Hi-Fi Sound, Comfortable, Wireless, Foldable, Large capacity battery.
Package Contents
Please check the package for the following items:
- VIVO B39 Wireless Bluetooth Headphones
- Charging Cable (Type-C)
- User Manual
- Audio Cable (3.5mm)
Setup and First Use
1. Charging the Headphones
Before first use, ensure the headphones are fully charged. Use the provided Type-C charging cable to connect the headphones to a USB power source (e.g., computer, wall adapter).
- A full charge typically takes approximately 2 hours.
- The LED indicator on the headphones will show charging status (e.g., red for charging, blue/off for fully charged).

Figure 2: Battery information, showing 400mAh battery capacity, 10 hours playtime, and 20 days standby time.
2. Bluetooth Pairing
- Ensure the headphones are turned off.
- Press and hold the Power button on the headphones until the LED indicator flashes rapidly (usually blue and red alternately), indicating pairing mode.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "B39" or "VIVO B39" from the list of available devices.
- Once connected, the LED indicator on the headphones will typically show a solid blue light or flash slowly.
Video 1: Product showcase demonstrating the headphones' foldable design and LED lighting during operation.
3. TF Card Music Playback
The headphones support TF (MicroSD) card music playback (128MB-16GB).
- Insert a TF card with your desired music files into the designated slot on the headphone.
- The headphones will automatically switch to TF card playback mode.
- Use the control buttons to play/pause, skip tracks, or adjust volume.

Figure 3: Illustration of the TF Card Music Playing feature with a TF card inserted into the headphone.
4. Wired Connection (Audio Cable)
For devices without Bluetooth or when battery is low, you can use the provided 3.5mm audio cable.
- Connect one end of the 3.5mm audio cable to the headphone's audio jack.
- Connect the other end to your audio source (e.g., phone, computer, MP3 player).
- The headphones will operate in wired mode, and Bluetooth functionality will be disabled.

Figure 4: Demonstrates the wired/wireless free switching capability using a 3.5mm audio cable connected to a laptop.
5. Folding Design
The headphones feature a foldable design for easy storage and portability.
- Gently fold the earcups inwards towards the headband to reduce their size.
- This design helps save space and makes them convenient to carry.

Figure 5: Shows the foldable design of the headphones, emphasizing portability.
Operating Instructions
1. Power On/Off
- Power On: Press and hold the Power button until the LED indicator lights up (usually blue).
- Power Off: Press and hold the Power button until the LED indicator turns off.
2. Music Playback
- Play/Pause: Press the Multi-function button (often the Power button or a dedicated play/pause button).
- Next Track: Press and hold the Volume Up button or a dedicated 'Next' button.
- Previous Track: Press and hold the Volume Down button or a dedicated 'Previous' button.
3. Volume Control
- Increase Volume: Press the Volume Up (+) button.
- Decrease Volume: Press the Volume Down (-) button.
4. Call Functions
- Answer/End Call: Press the Multi-function button once.
- Reject Call: Press and hold the Multi-function button for 2 seconds.
- Redial Last Number: Double-press the Multi-function button.
5. Active Noise Cancellation (ANC)
The VIVO B39 headphones feature Active Noise Cancellation to reduce ambient noise.
- To activate/deactivate ANC, locate the dedicated ANC button (if present) or refer to the specific button functions on your device.

Figure 6: Illustrates the Intelligent Noise Reduction feature with a frequency graph showing noise reduction.
Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the headphones. Do not use abrasive cleaners or solvents.
- Storage: When not in use, store the headphones in a cool, dry place. Utilize the foldable design to save space and protect them from damage.
- Battery Care: To prolong battery life, avoid fully discharging the headphones frequently. Charge them regularly, even if not in constant use.
- Avoid Moisture: Although the headphones are described as "Waterproof and sweatproof" in some features, avoid prolonged exposure to water or high humidity to prevent damage.

Figure 7: Highlights the breathable earmuffs designed for comfort during long listening sessions.
Troubleshooting
- Q: Headphones won't turn on.
- A: Ensure the headphones are fully charged. Connect them to a power source using the Type-C cable and allow them to charge for at least 30 minutes before attempting to power on again.
- Q: Cannot pair with my device.
- A:
- Make sure the headphones are in pairing mode (LED flashing blue/red).
- Ensure Bluetooth is enabled on your device and it's within 10 meters of the headphones.
- Try turning off and on Bluetooth on your device, or restarting both the headphones and your device.
- Clear previous Bluetooth connections on your device if you have too many.
- Q: No sound or low volume.
- A:
- Check the volume levels on both the headphones and your connected device.
- Ensure the headphones are properly connected via Bluetooth or the 3.5mm audio cable.
- If using a TF card, ensure the music files are in a supported format and the card is inserted correctly.
- Q: Is it compatible with Nintendo Switch?
- A: The headphones support Bluetooth 5.1 and can connect to various Bluetooth devices including mobile phones, computers, and tablets. For Nintendo Switch, Bluetooth audio support varies by model and system update. You may need to check your Switch's system settings for Bluetooth audio compatibility or use the 3.5mm audio cable for a direct connection.
Specifications
| Feature | Specification |
|---|---|
| Model | B39 Bluetooth Headset |
| Brand | VIVO |
| Material | ABS |
| Communication | Wireless (Bluetooth) |
| Bluetooth Version | 5.1 |
| Wireless Range | Up to 10 meters |
| Battery Capacity | 600 mAh |
| Battery Life (Playtime) | Up to 12 hours |
| Call Duration | Up to 12 hours |
| Standby Duration | Up to 800 hours (20 days) |
| Charging Time | Approx. 2 hours |
| Charging Method | Cable (Type-C) |
| Frequency Response Range | 20 - 20000 Hz |
| Frequency Range | 2.402-2.480 GHz |
| Sensitivity | 50 dB |
| Resistance | 32 Ω |
| Earcups Type | Semi-open |
| Number of Drivers | 2 |
| Microphone | Yes (HD Microphone) |
| Noise Cancellation | Active Noise-Cancellation |
| Sound Isolating | Yes |
| Volume Control | Yes |
| Control Button | Yes |
| TF Card Support | Yes (128MB-16GB) |
| Weight | 300g |
| Features | HiFi Sound, Foldable Design, Multi-device support, Super Clear Call, Long Endurance, Comfortable to wear, Waterproof and sweatproof (Note: Avoid prolonged water exposure) |

Figure 8: Detailed product parameters including model, battery, and frequency information.
User Tips
- Comfortable Fit: Adjust the headband length to ensure the earmuffs sit comfortably over your ears for the best sound experience and long-term wear. The soft material of the earmuffs is designed for extended comfort.
- Versatile Connectivity: Remember you can switch between wireless Bluetooth mode and wired mode using the 3.5mm audio cable, offering flexibility for different devices and battery situations.
- TF Card Convenience: For music on the go without needing a connected device, utilize the TF card slot. This is great for travel or when you want to save phone battery.
Warranty and Support
For any product-related inquiries, technical support, or warranty claims, please contact the seller or retailer from whom you purchased the VIVO B39 headphones. Keep your purchase receipt as proof of purchase.





