B39 Wiress Bluetooth Headset 1. Seven-color LED breathing light, surround sound effect 2. Colorful lighting, audio synchronization, ultra-clear call, HIFI sound , long-lasting battery life, TF memory card, comfortable to wear, sweat-proof 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. Battery life: 8 hours 8. Listen to 280 songs in a row 9. Chann: stereo 10. Transmission range: 10 meters 11. Function: power display, call function, NFC function, support music, multi-point connection 12. Bluetooth protocol: 5. 113. How to use: head-mounted 14. Battery capacity: 600mAh