Wireless UHF microphone set. It consists of a hand-held transmitter of small dimensions with a dynamic insert powered by a built-in Li-ion 850mAh, 3.7V battery. The receiver is small, powered by a built-in Li-ion 600mAh, 3.7V battery and plugs directly into an active speaker system or mixing console using a 6.3mm Jack connector. Battery life is 6 hours and charging time is 3-4 hours. The set allows you to choose from 16 channels in the UHF 679-694 MHz band. Output signal level: 0.9V