B39 Wireless Bluetooth Headset Subwoofer With Breathing Light Support TF Card 1. Seven-color LED breathing light, surround sound effect 2. Colorful lights, audio synchronization, ultra-clear calls, HIFI sound quality, 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, balanced 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: 5.1 12. Battery capacity: 600mAh Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.