Best Sound In-ear Amplifier Super Mini Hearing Aid Aids Device Adjustable Tone Personal Ear Care Tools High Quality | Красота и

Характеристики

Sound Output (SSPL) 120+3db
Sound Gain (DSPL) 25±5db
E0 Input Noise 32db
Frequency Range 450Hz~5000Hz
Working Current 2mA
Harmonic Wave Distortion(THD) 4%
Battery/Cell Type A10
Voltage D.C.1.3V
There are Whistle as you put the battery into the hearing aid .

Please donot worry .because the air presure will make Whistle.
1.Please adjust lower volume .
2.Choose the suitable ear plug
3.Make sure if you put the earplug tightly,sound leak will make the Whistle.