â  Analogue BTE, compact size      â  Volume controlâ  On/off switchMax Sound Output:        129dB ± 4dBMax Sound Gain:           50dB ± 5dBHarmonic Wave Distortion: â¤5%Frequency Range:          450~3500 hzInput Noise:               â¤30 dBBattery:                   AG13       Working Voltage          dc1.5V           Working Current:          â¤4mA     Â
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