Best Rechargeable Digital BTE Hearing Aid, Adjustable Tone Sound Amplifier, Digital Sound Amplifier for Deaf Elderly

Details:

1.Max sound output:118±4dB

2.Sound gain: ≥32dB±2dB

3.Total harmonic wave distortion: ≤7%

4.Frequency range:300-4500MHz

5.Input Noise:≤32dB

6.Voltage:d.c.3.7V

7.Current:≤2mA

8. Full charging about 2-4 hours

9. Normal working about 35 hours