Επαναφορτιζόμενο Ακουστικό Βαρηκοΐας

1.Max Sound Output: 130±4 dB
2.Max Sound Gain: ≥46 dB±5dB
3.Harmonic Wave Distortion ≤4%
4.Frequency Range: 300~4000 hz
5.Input Noise: ≤28dB
6.Max Working Hours with Standard
7.Battery: 30 h
8.Working Voltage: D.C. 1.2V
9.Working Current: ≤4 mA
10.Rechargeable hearing aid