1.Max Sound Output: 130
2.Max Gain: 50 ± 5
3.Harmonic Wave Distortion: ≤5% (AT 1000 Hz)
4.Input Noise: ≤ 30 dB
5.Frequency Range: 300Hz ~ 4000Hz
6.Working Voltage: 1.5V
7.Working Current: ≤ 6.8 mA 8.Battery: AG13 or A675
* Hearing aid coil sensitivity >100dB * A-90dB SLPLNPUT
B-60dB SLPLNPUT
C-70dB SLPNPUT