Radio Receiver Sets
The radio receiver sets include a radio receiver & remote(s). Most of the radio receivers attach directly to the garage door opener terminal strip which power the receivers. Some openers may not have a terminal that supplies power so it that case you could use a transformer to power the receiver or you could use one of the plug-in radio receiver sets like the 365LM Liftmaster Receiver or the 75424 Marantec Receiver which have a transformer built into the unit. Those receivers are then plugged into an outlet and two wires from the receiver to the opener are attached to make a connection.