Hearing Aid Audiphones Sound Amplifier US Plug(Golden)

1. Material: ABS2. Built-in lithium battery 30mAh3. Charging time: about 2 hours4. Working voltage: d.c.3.7V5. Working time: about 35 hours6. Frequency range: 450-3400MHz7. Input noise: less than or equal to 32dB8. Working current: less than or equal to 1.2mA9. Total harmonic distortion: less than or equal to 10%10. Sound output: less than or equal to 129±3dB11. Sound gain: greater than or equal to 40dB±5dB12. Net weight: 6.5g