The Whirlwind Micmute Push to Mute Desktop Momentary Off Mic Switches meaning that the input signal is normally on, passing through the box. When the switch is depressed and held down, the signal is turned off or muted. The signal is reconnected as soon as the switch is released. It has a female XLR input and a male XLR output jack. When no signal is passing through the boxes, the output jack is configured to mute the input of the connected audio device.