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1. Material: ABS
2. Built-in lithium battery 30mAh
3. Charging time: about 2 hours
4. Working voltage: d.c.3.7V
5. Working time: about 35 hours
6. Frequency range: 450-3400MHz
7. Input noise: less than or equal to 32dB
8. Working current: less than or equal to 1.2mA
9. Total harmonic distortion: less than or equal to 10%
10. Sound output: less than or equal to 129±3dB
11. Sound gain: greater than or equal to 40dB±5dB
12. Net weight: 6.5g
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