The Nady DKW-1 LT/HM3 wireless microphone system delivers crisp, clear audio using the VHF band. Its well suited for use in a studio or with a PA system, home recording system, karaoke system and more. With a unidirectional polar pattern and 20 dBA noise level, the microphone system is able to transmit the input and minimize unwanted ambient noise. The on/off switch lets you conserve battery power. Mute button comes in handy for those times when you want to keep to yourself. Runs on 9 V battery thats included.