Encrypted DIP style single-button remote control
Features Security+ 2.0 technology
Ideal for applications such as gated communities or commercial applications requiring a large number of remotes for a common entrance
Dual 12-position DIP programming offers up to 4,096 codes
Narrow band transmission on 3 simultaneous frequencies (310, 315, 390 MHz)
Compatible only with Security+ 2.0 commercial receivers and operators
811LM can be programmed into the 850LM with a lower security but also can be used as a dip switch technology similar to the 3089 multicode.
Something very important on the 811LM is that it will not work with any Liftmaster Garage Door Opener.