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1. Accessories: host (1) USB cable (1) charging base (1) brush (1) earplugs (6) English manual (1)
2. Output power: 3.6mW
3. Maximum sound output: 130 ± 4dB
4. Sound gain: 30 dB
5. Frequency range: 100--4000 Hz
6. Equivalent input noise: ≤28dB
7. Harmonic distortion: ≤6%
8. Continuous working time: ≥15 hours
9. Battery capacity: 40 mA battery is a rechargeable battery
10.Working current: ≤3 mA
11. Working voltage: 1.2V
12. Speaker impedance: 110 ohms
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