Craftsman 635LM is a universal receiver that allows you to control your garage door or gate with a remote control. It is compatible with most garage door openers and gates manufactured after April 1, 1982. The receiver can be programmed to work with up to 8 remote controls and one Security Keyless Entry. It also features Security+, which changes the code between the remote control and the receiver with each use, accessing over 100 billion new codes.