The 371AC is a single-button visor remote 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. Program the remote using the purple LED light on compatible Liftmaster openers. The transmitter controls one garage door and can toggle the opener's lights on and off. A visor clip and key ring are included for flexible mounting options. Note: Homeowners near military installations may experience interference from Land Mobile Radio (LMR) equipment operating at 390 MHz, which shares the same frequency band as Chamberlain, Liftmaster, Sears Craftsman, and Genie openers. If interference occurs, Liftmaster offers the 355LM Conversion Kit, which operates on an alternate frequency to resolve compatibility issues.