The Whirlwind Micmute PMD gives you passive switching for controlling the on/off conditions of a mic or balanced line signal right from your desktop. The Micmute PMD sports a finger-operated push-to-mute switch, a female XLR input and a male XLR output jack. When no signal is passing through it, the output jack mutes the input. The input signal is normally on, passing through the box. When the switch is pressed and held down, the signal is muted. The signal is reconnected as soon as the switch is released. The Whirlwind Micmute PMD - what a handy little box! Whirlwind Micmute PMD Features at a Glance: Desktop push-to-mute switchbox Finger-operated switch Female XLR input; male XLR output jack Automatic muting with no signal is present at the input Made in the USA Get easy desktop switching for mic or line signals with the Whirlwind Micmute PMD!