Model 376LM / 376LMC operates on 315MHz frequency and is compatible with LiftMaster garage door openers featuring a purple "learn" button. The wireless keyless entry system uses a personalized 4-digit password with up to 10,000 possible combinations that can be changed at any time. Rolling code technology generates over 100 billion unique codes with each use for enhanced security, while a temporary password feature allows time-limited or entry-limited access for visitors and service personnel. Activation occurs by entering your password and pressing the Enter button.