CIC Hearing Aids Rechargeable Invisible Wireless Hearing Aid Sound Amplifier(Skin Color)

1. Double noise reduction, no need to adjust2. Charge for 2 hours, battery life is 30 hours3. Type: In-Ear4. Power supply: rechargeable5. Working voltage: 3.7V6. Rated operating current: less than or equal to 1.4mA7. Frequency response: should not be narrower than 300-50008. Maximum saturated sound output: less than or equal to 128+/-3 decibels9. High frequency average: 106dB +/- 4dB10. Gain: 28db+/-5db11. Total harmonic distortion: less than or equal to 7%+3%12. Equivalent input noise: less than or equal to 29+3db13. Dimensions: diameter 42 x 31mm14. Net weight: 4.3g