DR90 Wireless Headphones Headwear Creative Heavy Bass Effect Ultra Long Endurance EarphonesFunction: 1. USB charging: Type C 2. Signal to noise ratio: 88db 3. Bluetooth link distance: 10 meters 4. Output power: 35mW 5. Bluetooth frequency: 2. 401 2. 480GHz 6. Charging time: 4 hours 7. Usage time: 12 15 hours 8. Standby time: 18 hours 9. Dynamic horn: 40mm 10. Battery capacity: 400mAh 11. Chip solution: Jerry Bluetooth 5. 3 Function: Adjust volume, switch songs, answer incoming calls, reject incoming calls, hang up calls, Bluetooth playback,