The LiftMaster 635LM Garage Door Opener Universal Plug-In Receiver with a Built-In Transformer is easy to install and is compatible with all LiftMaster Security+ remote controls. The 390MHz transformer plugs into any standard polarized 120V, 60Hz AC outlet and hard-wires directly to any garage door opener strip. It comes with a two-conductor bell wire included as well as a built-in door control button. Other features include: •Momentary contact closure •Five-amp relay type contact •A power indicator light •Push-button Smart Garage Door Opener receiver •Accepts up to eight Security+ remote control codes or 1 DIP switch and 12 billion code remote control codes •Accepts one keyless entry code Compatible with LiftMaster remotes: •One-button LiftMaster 971LM •Two-button LiftMaster 972LM •Three-button LiftMaster 973LM •Wireless Keypad LiftMaster 976LM Also works with older Craftsman and Chamberlain openers and remote controls.