Features:
1.Max sound out put:117+/- 3dB
2.Sound gain:>= 25dB+/- 5dB
3.Total harmonic wave distortion:<= 7%
4.Frequency range:400-4500MHz
5.Input Noise:<=32dB
6.Voltage:d.c.1.2V
7.Current:<=6mA
8.Main unit, Charing 2 hours for 12 hours use
9.Charing case 90 mins for hearing aids charing 3~4 times
