This is a voice activated switch and can be used on transmitters, CB radio etc. making unnecessary to use the PRESS TO TALK switch, something very useful when we need hands free operation. It can also be used for voice recordings to switch the tape recorder ON and OFF whenever somebody says something, thus making the tape last much longer. It has a MIC input, a delay circuit and adjustable sensitivity. As a power supply you can use the SMART KIT 1061.