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Wired And Wireless 2In1 Handheld Microphone Receiver System Unidirectional For Speeches Meetings Karaoke Performances This microphone combined both wired and wireless functions. Wireless let you singing free of dragging cord. Wired let you singing without the concern of battery power off. You can use this for speeches, lectures, meetings, karaoke, music performances or anything else.Easy operation and convenient use. You will love it!Brand and high quality. 2in1 Wired Wireless functions. Wireless let you singing free of dragging cord. Wired let you singing without the concern of battery power off.The length of the Microphone Cord:2.5mMicrophone sensitivity: -54dB +/- 3dB(0dB=1V/Pa)Directivity: Un-directionalFrequency response: 100Hz-10,000HzOut put impedance: 600ohmOperating voltage: DC 1.5VWorking distance: 8-20mImpedance:600 ohmS/N ration: greater or equal to 60dBReception sensitivity:30dB/uVProducts using the power: 1X AA Battery (Not include battery)How to use:Easy operationWired: Make sure the battery is not in the Microphone. And plug the cord to the microphone and your audio amplifier. Switch microphone to MIC position, and start to sing.Wireless: Install batteries in