MPX/303: Emergency Transmitter (Discontinued)

The Model MPX/303 Emergency Transmitter is a battery powered, portable, water-resistant miniature transmitter designed for use with Linear’s MegaCode Format receivers. The transmitter can be used in a limitless number of wireless remote control applications. Squeezing both side buttons on the transmitter triggers the internal sounder and sends a digitally coded wireless signal to its companion receiver. The transmitter can also report a low battery condition. Squeeze the buttons for a minimum of two seconds to insure receiver activation.

The MPX/303 transmitter is powered from two type 2032 lithium batteries with an expected battery life of about 5 years. The red test/operate indicator on the top of the transmitter lights during operation. If the batteries are low, a special tone series will play from the internal sounder when the transmitter is activated.

A detachable neck chain and belt clip are provided with each transmitter.


  • Two-button lockout operation
  • Water-resistant
  • Belt clip and neck chain included
  • Test/operate LED
  • Type 2032 lithium batteries supplied
  • Megacode format
  • RF frequency: 303.875 MHz
  • 2.0″ W x 2.75″ H x 0.375″ D
  • Order number: SNT00342

Installation Manual