1. Microphone head size: ¢6.0mm
2. Mi sensitivity: -58DB+/-3DB
3. Frequency response: 10~16K
4. Speaker impedance: 16Ω
5. Battery capacity :800mAh
6. Charging time :2.5h
7. Working hours :15h
8. Sending and receiving distance :≥10M
9. Transmit power :≤9dbm
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