The LiftMaster 635LM Universal Plug-In Receiver with Built-In Transformer is a 390 MHz external radio receiver designed to add remote-control capability to a wide range of garage door openers and gate operators. Powered by an integrated transformer that plugs into a standard 120V AC outlet, this universal receiver delivers a dry-contact output to the operator’s wall-control terminals, making it a practical replacement part or upgrade for residential and light commercial applications. Operating on LiftMaster/Chamberlain/Craftsman Security+ rolling code technology at 390 MHz, it offers dependable wireless operation when paired with compatible 390 MHz Security+ transmitters and keypads.
Installation is straightforward: plug the 635LM into a grounded 120V outlet, connect two low-voltage wires from the receiver’s relay terminals to the opener’s push-button inputs, then use the onboard Learn button to program compatible 390 MHz Security+ remotes. For best range, mount the antenna away from metal surfaces and high-interference sources. This receiver is intended for indoor locations and for use with operators that provide proper entrapment protection in accordance with UL 325 or applicable local codes. Compatibility note: it is designed for 390 MHz Security+ gear and is not intended for newer Security+ 2.0 (yellow Learn button) or 315 MHz systems.
