The Whirlwind Micmute PPD Latching Switch-On/Switch-Off Desktop Design Audio Switch is configured as latching Push On; Push Off switches, meaning that the switch must be pushed and released to turn the signal on or off through the box. Each time the switch is toggled the signal is changed from one condition to the other.
It has an indicator LED feature that is operational when the connected microphone preamp input is providing phantom power. The blue LED illuminates to indicate that the mic is live and signal is passing through the Micmute box. The LED is not functional when phantom power is not present. The Micmute PPD uses an indicating rocker switch, which displays a red bar when the signal is turned on.