Alectro Systems Inc.


Microphone ON/OFF Switch with Phantom Powered Indicator LEDs

The Alectro Systems MMSI is a Latching Microphone Mute Switch with indicator lights. It works with any balanced Dynamic or Condenser microphone having a standard 3 pin XLR connector, enabling you to turn the microphone on and off without producing a click or pop on your sound system. The unit has one Female XLR connector to plug in the microphone cable and one Male XLR to connect to your mixer.

A Blue LED indicates that Phantom Power is present, and a Green LED indicates when the microphone is turned ON. When the LEDs are not lit, they appear Clear, so there is no confusion whether they are on or off. If you don’t have Phantom power, the unit will still function, however the indicators will not illuminate.

Three versions are available. The standard MMSI-T comes with a toggle switch and can be placed on, or attached to, a flat surface.

The MMSI-F comes with a Push Button Foot switch for use on the floor.

The MMIS-R comes with a separate front panel which can be mounted flush into a flat surface (such as a pulpit or podium). It plugs into a remote unit which can be located nearby (inside the pulpit or podium).

The device is housed in a rugged steel case, about 3.75”w x 3”h x 1.75”d. It can be easliy opened by removing four screws from the top of the lid. This reveals four holes in the bottom of the chassis through which you can screw the device to a table top or other surface for permanent mounting.

Because the cover screws are in the top rather than the sides, the unit can be fastened close to a corner without making it difficult to re-assemble.

The MMSI is supplied with rubber feet and double sided foam tape to provide several mounting options.

Watch a 4-3/4 minute Video about this unit


- Turns Microphone On and Off with no noise on speakers (even Condenser Mics)
- Rugged Steel Construction
- Easily mounts on a flat surface with screws or tape, or left portable
- Remote version flush mounts into the table surface
- Indicator LEDs for Phantom Power and Microphone ON
- LEDs are Clear when not lit
- Uses Phantom Power for the indicators, no battery or power supply
- XLR In and Out
- Available with Toggle (MMSI-T), Foot switch (MMSI-F) or remote (MMSI-R)
- NOT made in China (Made in Canada)






Downloads and Links

Product Data Sheet (pdf 190kb)
Price & Purchase


4-3/4 minute MMSI Video