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Medical equipment Medical supplies box hearing aid for the elderly
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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\"