Maximum sound output: 129 ± 3dB
High-frequency average OSPL90：120±4dbB
Maximum sound gain: 38dB ± 5dB
Total harmonic distortion：≤8%
Frequency range: 500Hz-5000 Hz
Equivalent input noise level：≤32dB
Working current≤2mA

1. USB charging, four sound adjustmentsHave a charging indicator light

2. Imported chips, intelligent noise reduction
3. Soft silicone and ear hooks are designed with a humanized arc, comfortable and painless to wear for a long time 
4. hearing Aid Working time:35 Hours, Charging time:2 Hours. The charge box can charge two hearing Aids 5 times after charging in full.
5. Don’t have left and right ear limits.8,4 mode for noise reduction”