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Hearing aid 1.Max Sound Output: 130dB ± 4dB 2.Max Gain: 52 ± 5dB 3.Harmonic Wave Distortion: ≤8% (AT 1000 Hz) 4.Input Noise: ≤ 28 dB 5.Frequency Range: 300Hz ~ 4000Hz 6.Working Voltage: 1.5V 7.Working ...