A-60 USB Rechargeable Hearing Aids Adjustable Tone Sound Voice Amplifier, A-60 - A-60

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1. Sound output (MAX): 129+/-4 dB2. Sound Gain (MAX): 50dB +/- 5dB3. Harmonic distortion: less than or equal to 5%4. Frequency range: 450~3500hz5. Input noise: less than or equal to 30 dB6. Battery: Lithium battery7. Working voltage: DC 3.7V8. Working current: less than or equal to 3mA9. Dimensions: 6.6 x 1.3 x 1.3cm10. Net weight: 26g11. Please do not use the computer to charg...