2PCS Rechargeable Digital Invisible Hearing Aids Sound Voice Amplifier Enhancer

Description

Features:
1.Max sound out put:115+/- 3dB
2.Sound gain:>= 28dB+/- 3dB
3.Total harmonic wave distortion:<= 3%
4.Frequency range:300-3500MHz
5.Input Noise:<=32dB
6.Voltage:d.c.1.2V
7.Current:<=2mA