1. Function: Built-in microphone, can answer the phone, listen to music, etc. 2. Multifunctional use, can be used as Bluetooth headphones, hair bands, sleep eye mask, wrist guards, etc. 3. Rear elastic elastic cord, adapt to different head circumference 4. Up to 13 hours of battery life, charging 1.5 hours 5. Bluetooth transmission signal stability, low power consumption, no lag 6. High-value leather label control button, advanced technology, firm and not off-line 7. Bluetooth module can be disassembled out, headband can be cleaned separately 8. Bluetooth protocol: 5.0 + EDR 9. Transmission range: no obstacle 10 meters or more 10. Size: stretch range 24.5-33.5cm
