Shure A120S In-Line On/Off Switch — Configurable Inline Microphone Control
A120S Overview
The Shure A120S is an inline on/off switch designed to add flexible microphone control to professional audio installations and live applications. It supports latch on/off, push-to-talk, and push-to-mute (cough button) configurations, making it adaptable to a wide range of use cases. The unit can be wired normally-open or normally-closed and is compatible with both balanced mono and unbalanced stereo audio signals. It is well suited for broadcast facilities, houses of worship, conference environments, and any installation requiring discrete microphone switching.
The A120S is contoured for comfortable in-hand use and includes an attached belt clip that rotates to four positions for convenient mounting flexibility. Supplied unterminated, the unit requires installer soldering to configure the desired function.
Key Features
- Configurable Switch Modes — Supports latch on/off, push-to-talk, and push-to-mute (cough button) operation to meet varied user requirements
- Normally-Open or Normally-Closed Wiring — Installer-selectable wiring configuration for maximum installation flexibility
- Pushbutton and Rotary Knob Action — Combined pushbutton and rotary knob provide either spring-return momentary or locking action
- Balanced and Unbalanced Signal Compatibility — Works with balanced mono audio signals or unbalanced stereo audio signals
- Ergonomic Contoured Body — Shaped to fit comfortably in the hand during extended use
- Rotating Belt Clip — Attached belt clip rotates to four positions for versatile mounting options
- Unterminated for Custom Wiring — Supplied unterminated, allowing the installer to solder appropriate wiring for the desired configuration
- Strain Relief Included — Supplied with a crimp-on strain relief for 6.4mm (0.25 in.) diameter cable and flex relief for large or small diameter cables

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