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Specifications Mic Connection: Wireless connection Mic: HiFi Pickup Speaker:6W Frequency Response Range: 106HZ- 20KHZ Distortion: <=3% Maximum Sound Pressure Level:>= 90dB Bluetooth Transmission Distance: 1 OM Mic Connection Distance: 10M Input Charging Voltage: 5V=1A Battery Specification:3.7V 2000mAh battery Working Time: 4-5H Charging Time: 4H Working Temperature: -10° C-45° C