Product parameters:
1. Bluetooth version: Bluetooth 5.0.
2. Bluetooth distance: 10m.
3. Output power: 40mW.
4. Driver: 15mm.
5. Impedance: 9 ohms.
6. Frequency response: 20-20000Hz
7. Working voltage range: 3.0V-4.2V
8. Charging time: 1 hour.
9. Single headset use time: 3 hours.
10. Music playback time: 10 hours.