Specifications
| 1. Max Sound Output: ≤117dB + 3dB |
| 2. Max Sound Gain: 33dB ± 5dB |
| 3. Average Sound Gain: 28dB ± 5dB |
| 4. Harmonic Wave Distortion: ≤5% |
| 5. Frequency Range: 400Hz~4500Hz |
| 6. Input Noise: ≤ 29dB+3dB |
| 7. Battery: Rechargeable polymer lithium ion |
| 8. Rated Current: ≤ 5mA |
| 9. Working Voltage: DC 3.7V |
| 10. Working time：35-48 Hours |
| 11. Charging time of charging box 90min |
| 12. Charging current ≤100mA |
| 13. Charging voltage 3.7V |
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