The 974LM / 94LM is a 4-button garage door opener remote with rolling code technology and Security+ compatibility. It operates at 390 MHz frequency with over 100 billion rotating codes for enhanced security. Features one dedicated "LEARN" channel to activate shared radio-controlled devices. Includes a visor clip for convenient mounting. Compatible with all Security+ systems, including Chamberlain, Sears, Craftsman, and Raynor residential openers.