Adopts UHF technology, remote wireless transmission makes operation easier without annoying wires, can achieve 20m of the transmission distance. Broader frequency range, less interference, showing your voice easily and perfectlyAdopts the exacting complete electronic circuit control, capture rich, full-bodied sound from sources that are directly in front of the microphone. For all events like Karaoke, live-performances, conference, church, school, hall, party, etc.USB receiver power supply by USB charger,powbank and more.Suitable for studio / karaoke / radio / etcV20:frequency: A:262.85MHz B:268.85MHzdistance: 30-50sPCB board: +5-9VAudio frequency response: 40HZ~15KHZAudio dynamic range: more than 100dBAudio output: 0-200mvMaximum operating distance: more than 80 meters/mReceiver power supply voltage: 3.7v-4.2v (lithium battery)Receiver working current: less than 80mAReceiver continuous working time: standard (3.7v/800mA) 10 hoursTransmitter working current: less than 80mATransmitter working time: 10-18 hoursColor: blackMaterial: plasticSize: 250x50mmPackage Contents:1 x pair of microphones1 x adapter1 x connection line1 x receiver (Without battery)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.