B39 Wiress Bluetooth Headset 1. Seven-color LED breathing light, surround sound effect 2. Colorful lights, audio synchronization, ultra-clear calls, HIFI sound , long-lasting battery life, TF memory card, comfortable to wear, waterproof and sweatproof 3. Bluetooth 5.1 chip, faster and more stable connection, clear and smooth listening to songs and games 4. Strong and optimal material, comfortable and long-lasting to wear 5. Large-diaphragm loudspeaker, d and restored sound layering 6. High-definition noise reduction, breathable earmuffs, no pain after long-term wear 7. Charging time is 2 hours, standby time is 800 hours 8. Listen to 280 songs continuously, and the talk time is 12 hours 9. Support TF card: 128M-16GB 10. Transmission range: 10 meters 11. Bluetooth protocol: 5. 112. Battery capacity: 400mAh