Premium Bluetooth Hearing Aid - V91. Output: OSPL90 Max. 125dB5dB 2. FOG50 MAX Gain 30dB5dB 3. FREQUENCY RANGE(Not narrower than): 300Hz 5000Hz 4. Working Current : 6mA 5. Total Harmonic Distortion <10% 6. Working Voltage D. C 3. 7V 7. Play Time: 5 hours
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