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Liftmaster's new 813LMX is a programmable DIP switch 3-button transmitter that operates on three different frequencies: Security+ 2.0 Encrypted DIP, 315 MHz, and 390 MHz. The 813LMX provides the same functionality and replaces their full line of three button DIP remote controls, including: 813LM, 333LM, and 33LM. All applications where these older remotes were used can now be accommodated by the new 813LMX when programmed to the specific mode needed. The 813LMX is compatible with all Liftmaster 315 MHz, 390 MHz and Security+ 2.0 Gate Operators, Garage Door Openers, and Radio Controls.
Programmable DIP 3-Button Remote Control
Three Buttons have Open/Close/Stop functionalities
Replaces LiftMaster 813LM, 333LM, and 33LM transmitters
Compatible with Liftmaster Security+ 2.0, 315 MHz, and 390 MHz Gate Openers, Radio Controls, and Garage Door Openers
Straightforward DIY DIP Programming
Open the door on the top cover and to the right of the DIP connector is a program button.
Press the button to enter 'Program Mode' and press the remote control button one time for 813LM, twice for 333LM, and three times for 33LM.
Press the program button again to exit program mode