✮Chipset: Bluetrum
✮Battery capacity: 50mAh
✮Transimission distance: 30M-40M(barrier-free)
✮Working time: 4-5H
✮Noise ratio: 70DB
✮Transmission delay: 30MS
✮Sensitivity: -42DB
✮Frequency response: 20-20K Hz
✮Working temperature: -10°C~45°C
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