QTX SOUND VH1 Handheld Wireless Microphone with upto 50m Range in a Carry Case. The Mike works on VHF  Frequency 174.5 Mhz and is Licence Free. Mike runs on 9V PP3 Battery, test one supplied, but for best result please use Duracell brand. The Receiver unit runs on the AC/DC Adaptor included. Suitable for use with most PA Amps and A/V Amplifiers, connect with 6.3mm lead supplied.