A120S is an in-line, balanced, locking or momentary switch for a microphone. It can be configured in several ways to meet different user requirements. Typical use cases include adding Latch On/Off, Push-to-talk, or Push-to-mute (cough button) to a microphone. The A120S is contoured to fit comfortably in the hand, and an attached belt clip rotates to four positions to allow convenient mounting. The A120S can be wired normally-open or normally-closed, and can be used with a balanced mono audio signal or an unbalanced stereo audio signal.