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Linear MegaCode Block Coded Key Ring Transmitter & Weigand Proximity Tag, 1-Channel


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Convenient & Durable Transmitter

Conveniently gain entry through your Linear access control system with the Linear MegaCode Block Coded Key Ring Transmitter & Weigand Proximity Tag (1-Channel). The single-button miniature transmitter sends one wireless code to any Linear MegaCode access control receiver or and control panel, allowing you to control MegaCode door/gate access systems and garage door openers.

  • Ideal for door, gate, and garage door operators
  • Eliminates need for separate proximity cards
  • Rugged construction for long-term everyday use
  • Comes with quick-disconnect key ring
  • Compatible with MegaCode products and 26-bit Weigand readers

Enhanced Security with MegaCode Technology

The transmitter is in 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.

Additional Features

A unique 10-second time-out feature prevents the system from being shut down by a single transmitter transmitting continuously.

The transmitter also contains a 26-bit Wiegand proximity tag programmed to the same block code as the transmitter. The tag is compatible with the AM-DPR Dual Proximity Reader. Waving the transmitter near the reader will request access from the system.


  • Transmitter
  • Key Ring
  • Batteries (pre-installed)

NOTE: The Weigand proximity tag is designed to work with Linear's model AM-DPR Weigand proximity reader. While third-party 26-bit Weigand readers may also be compatible, not all have been tested.

Security, Access Control and 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 products to include focused product lines in the Access Control, Remote Control and Garage Door Operator markets.


  • Manufacturer Part #: ACT-31DH
  • Power: Two type 2016 coin cell lithium batteries
  • Battery Life: 5 years
  • Codes: Factory block coded in MegaCode format
  • RF Frequency: 318 MHz
  • Proximity Format: 125 KHz non-proprietary proximity, 26 bit Wiegand
  • Dimensions: 1.25(W) x 2.25(H) x 0.48(D) inches
  • Warranty: 1 Year