Premium Bluetooth Black Hearing Aid - T0031. Output. OSPL90 Max. 105dB5dB 2. FOG50 MAX Gain 30dB5dB 3. FREQUENCY RANGE(Not narrower than): 200Hz 4500Hz 4. Working Current : 8mA 5. Total Harmonic Distortion <5% 6. Working Voltage D. C 3. 7V 7. Play Time: 8 hours
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