From Sweetwater: Part of what makes live performances so exciting is that you never know what's going to happen. This is doubly true if you're the performer. Be prepared to shut your mic off in an instant when you're plugged into the Power Mute from Pro Co. Whenever anything goes wrong, Power Mute lets you shut your mic off, keeping coughs, conversations, and even feedback from going out over the PA. The Power Mute can be used as either a momentary (press to mute or press to talk) or a latching (mic on/mic off) muting switch, giving you a ton of onstage flexibility.
This unit was used on a pedalboard with a sax mic and phantom power. I used it because sometimes stage volume can lead to feedback with powered condenser mics so this what kind of my panic button. It worked flawlessly the few times I used it. a clean mute with zero pops, which can happen when phantom power is on. I never used the power supply because I powered it with my Ciocks pedalboard power supply. The power is really only needed to power the LED that shows you whether the mute is on or off (selectable with the switch). It can also use batteries installed through the door on the bottom. This unit is in almost mint condition. you'd have to look very closely to see the minor signs of use.