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Item Type: Voice AmplifierBTE Hearing aid:Max Sound Output: 127±4 dBMax Sound Gain: 48dB ± 5dBHarmonic Wave Distortion: ≤5%Frequency Range: 450~3500 hzInput Noise: ≤32 dBBattery: AG13 Button batteries (Without Battery)Working Voltage: dc1.5VWorking Current: ≤3mAColor: As the picture shows