Liftmaster 374lm garage door opener This 4 button visor size remote is for NEW 2005 garage door openers by Liftmaster. Programmable by using the PURPLE LED light on the back of liftmaster garage door openers from 2005 and later 315 MHZ Frequency, over 100 billion codes with code rotating technology Offers Enhanced Radio Technology (ERT) 4 channel/button transmitter, compatible with models manufactured from 2005 and later Open/close up to four garage door openers Turn garage door opener lights on/off Visor clip or key ring included Lithium battery (5 years life w/normal use) included The military radio equipment, also known as ""Land Mobile Radio"" (LMR) operates at 390MHz, which is in the same frequency band as Chamberlain, Liftmaster, Sears Craftsman, and Genie garage door openers. Homeowners near these military bases may experience interference to their garage door openers that can cause the garage door opener to malfunction. In order to solve such interference problems as mentioned in the FCC Public Notice, homeowners can purchase a new liftmaster garage door operator OR a Conversion kit (includes a transmitter and a receiver) that operates on a different frequency that is not used by the LMR. If you need a conversion kit liftmaster offers one now called the Liftmaster 355LM Conversion Kit The Liftmaster 355LM Conversion Kit