Digital Hearing Aids Noise Cancelling 16 Channel Severe Loss Sound Amplifier ITE
Sound gain:>= 35dB+/- 5dB. Total harmonic wave distortion:<= 5%. Input Noise:<=32dB. Max sound out put:118+/- 3dB. Main unit, Charging 2~3 hours for 20 hours use. Frequency range:300-4500MHz.