The Pro Co Sound Sign Off is a passive latching microphone mute switch, designed especially for singing drummers, and any entertainers who require a latching rather than momentary microphone muter.

To operate the Sign Off, the user's microphone cable is plugged into the Sign Off and the Sign Off is plugged into the sound system. To cough or clear his/her throat, the user steps on the Sign Off switch, muting the microphone signal. Pressing the switch again unmutes the microphone and resumes regular communication with the audience.