In-Line On/Off Switch

The Shure A120S In-Line On/Off Switch is an in-line, balanced, locking or momentary switch for a microphone. The A120S 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. (Note: A120S is supplied unterminated; the installer must solder appropriate wiring to provide the function desired.) Its pushbutton combines with a rotary knob to provide either spring-return momentary or locking action. The unit is supplied with a crimp-on strain relief for 6.4mm (0.25-in.) diameter cable and with a flex relief for either large or small diameter cables.




Customer Support
Service & Repair

Detailed policy information regarding customer service numbers, service modifications, and replacement parts.

Service & Repair
Contact Us

Submit a ticket directly to Shure Customer Service staff, or reach out via phone or email.

Contact Us
User Guide & Specs
Find An Answer
In-line switch "A120S"
February 23, 2018

Yes, the Shure A120S is the correct model. ...

Fabricate the UA101 from the A120S
September 5, 2017

The UA101 is factory wired for audio Push-To-Mute as follows:Shorting the Ring to Sleeve of the 3.5mm T-R-S plug will mute the UC1 transmitter.  ...

How do I wire an A120S
December 9, 2010

HOW THE A120S WORKS:When the button is UP, the top and middle terminals are connected. When the button is DOWN, the middle and bottom terminals are co ...

Compatible Products