Maximum OSPL90: ≤118±5 dB
High frequency average OSPL90: 110±4 dB
Full sound gain: 36 ± 5 dB
Frequency response range: 500 Hz-5500 Hz
Total harmonic distortion: ≤3%
Equivalent input noise level: ≤26dB
Battery current: ≤2 mA
Rated voltage: 3.7 v

1. One-key switch, four sound adjustments, simple operation
   2. DC 2.0 cable charging, easy to charging
   3. Soft silicone earplugs, comfortable to wear
   4. Dont have left and right ears limit.
   5,Working time:30 Hours.
   6,Charging time:2 Hours.
   7,Have charging indicator light