LIFTMASTER 635LM Garage Door Plug-In Receiver 390MHz 115 Volt Plug-In 390MHz Universal Radio Control Receiver Compatible with RED / ORANGE Rolling Code, Security Plus Operators Wiring and instructions included Compatible with Liftmaster 971LM, 972LM, 973LM and 970LM (900 Series) remotes. Can be used / added to any Garage Door Operator