Digital Hearing Aids Rechargeable Behind Ear BTE Sound Voice Amplifier USBCharge

Specification: Maximum sound output: 118+/- 4dB Sound gain: >= 32dB+/- 2dB Total harmonic distortion: <= 7% Frequency: 300-3800MHz Input noise: <=32dB Voltage: DC 3.7V Current: <=2mA Charging time: 3 hours Normal working time: 45 hours Colour: silver Features: .

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