Apparecchi acustici digitali ricaricabili in-ear amplificatore vocale suono invisibile 1 paio

2/4 Hearing aids. 3、Mini appearance and small size, very invisible when wearing；. 1/2 Hearing Aid Case. Input noise level≤30dB. Full range sound gain 30±5dB. Maximum sound pressure level ≤112±3dB.

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