Spec. details:

1.Version: bluetooth 5.0

2.Li-ion Battery: 300mah

3.Charging Time: ≤2H

4Talking Time :4H      Standby Time:   180H

5.Driver Unit: 40mm

6..Sensitivity:   108dB ± 3dB                             

7. Impedance: 32Ω

8.Frequency Response: 20Hz-24KHz   

9.Transmission Radius:10m