The 81LM is a 1-button garage door opener remote designed for operators manufactured between 1993–1997. It operates at 390 MHz frequency and features a "Smart" coding button with green LED indicator. This 2-channel transmitter is compatible with "Billion Code" series operators and includes a visor clip for convenient mounting in your vehicle.
The LiftMaster 81LM 1-Button Vizor 390mhz Garage Door Opener Remote Control is compatible with Garage Door Opener models:Chamberlain 853CB, Chamberlain 856CB,
