The ESRSC is a control interface that enables a contractor to add external control, contact closure, programmable mute functions and status indication to any dynamic or condenser microphone. Switch function can be set to any of three operating modes: Touch-On/Off, Touch-to-talk (momentary on), and Touch-to-mute (momentary off). External contact closure capability permits control of remote devices from a user-supplied switch. A three-position switch "Local/ Remote / LED Remote" – enables the microphone and the LED status to be controlled locally or from an external device. In remote operation, the user-supplied LED and switch operate independently from the microphone. In LED Remote operation, the user-supplied LED is controlled from an external source.