The AccessMaster 372AC is a 2-button remote control designed for Liftmaster garage door openers manufactured in 2005 and later. It operates at 315 MHz frequency with over 100 billion rolling codes and Enhanced Radio Technology (ERT) for secure, interference-resistant operation. This 2-channel transmitter opens and closes up to two separate garage door openers and controls opener lights remotely. Programming is simple using the purple LED light on compatible Liftmaster openers from 2005 onward. The remote includes a visor clip or key ring attachment for convenient access. Note: Homeowners near military installations using Land Mobile Radio (LMR) equipment at 390 MHz may experience interference. If interference occurs, Liftmaster offers the 355LM Conversion Kit, which operates on an alternate frequency to resolve compatibility issues.