Model 373LM / 373LMC 3-button visor remote for garage door openers manufactured 2005 and later. Features 315 MHz frequency with Enhanced Radio Technology (ERT), over 100 billion rolling codes, and compatibility with Liftmaster openers from 2005 onward. Programmable via the purple LED light on compatible openers. Three independent channels control up to three separate garage door openers, operate opener lights, and open/close doors. Includes visor clip or key ring attachment and lithium battery (5-year lifespan with normal use). Note: Homeowners near military installations may experience interference from Land Mobile Radio (LMR) equipment operating at 390 MHz. If interference occurs, Liftmaster offers the 355LM Conversion Kit, which operates on an alternate frequency to resolve compatibility issues.