This great remote from Transmitter Solutions will work as a direct replacement of your Linear ACT-31B or ACT-21A and will work on any Linear Mega Code style receiver or any Linear Access Control Product. This Linear ACT-31B and ACT-21A compatible single button key chain remote is simple to program to work on your garage door opener, automatic gate opener or wireless access control device.
The unit is block coded, which means you can use this on the Linear AE100, AE500, or AE1000 systems that are programmed via modem or PC connection. 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.
-Compatible with all Linear access receivers and controllers
-Includes 12V battery, key chain clip, and programming manual
-Factory programmed MegaCode format supports over 1,000,000 codes
-RF frequency: 318 MHz
-Dimensions: 2.25" x 1.25" x .5"
-Two year manufacturers warranty