The 373LM is a 3-button remote control for use on commercial garage doors or gates. Learn more today. To determine which remotes are compatible to your LiftMaster receiver you will need the model number of your receiver. LiftMaster Remote Control and Keyless Entry Compatibility Find your garage door opener's LEARN Button to determine what model of remote control or keyless entry is compatible. The LEARN Button is located on either the back or the right side of the opener, near the hanging antenna wire. - Program and control up to three Garage Door Openers, Gate Operators or Commercial Door Operators. Discover the 373LM from LiftMaster. 373LM 3-Button Remote Control Premium Series Model 3240 X - Compatible with LiftMaster Security+315 MHz Garage Door Openers, Gate Operators and Commercial Door Operators. Use this article to determine LiftMaster receiver and remote compatibility.