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Linear MegaCode Key Ring Transmitters


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$25.00 to $28.00

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For Use With Linear’s Access Control Products

The Linear 1-Channel or 3-Channel Key Ring Transmitter is designed for use with Linear's access control products.

The ACT-21A is a single-channel device supplied with a quick-disconnect key ring. The ACT-22A is a three-channel device. Pressing the transmitter's left or right front button sends channel one or two. Pressing both buttons sends channel three. Also included are lithium batteries with a five-year service life.

A unique 10-second time-out feature prevents the system from being shut down by a single transmitter transmitting continuously. The transmitter is MegaCode format, which means each transmitter is factory preprogrammed with one of over 1,000,000 codes, virtually eliminating the possibility of code duplication. Because the receiver "learns" each specific code, no unauthorized person can gain access to the system by reprogramming a transmitter.

Available Channel Types: 1-Channel or 3-Channel

Security Products, Access Control & More By Linear

For more than forty years Linear LLC has been known as a worldwide provider of radio based transmitters and receivers for the traditional security market. Millions of Linear transmitters have been sold over the years. Linear security products are offered via a worldwide network of distribution. While Linear continues to be a leading supplier of devices for the security market, we have expanded our product lines to include focused product lines in the Access Control, Remote Control and Garage Door Operator markets.


  • Compatible with all Linear access receivers and controllers
  • Supplied with quick-disconnect key ring
  • Factory programmed MegaCode format supports over 1,000,000 codes
  • Two type 1616 lithium batteries supplied
  • RF frequency: 318 MHz
  • 1.25" W x 2.25" H x 0.48" D