Mk-v163 hearing aid ear canal sound charging built-in amplifier medical equipment medical supplies 

Saturation sound pressure: 110dB + 4dB

Full range sound gain: 30dB + 5dB

Harmonic distortion: 10% or less

Frequency response: 300~4000 hz

Equivalent input noise: 40 or less The db

Standard battery: A312 battery

Working voltage: , dc. 1.5 V

Operating current: less than or equal to 4 ma

\"Please read the product manual carefully or purchase and use the product under the guidance of the medical staff\"