LiftMaster Garage Door Openers 95LM Plug-In AC 24-Volt Transformer Power Supply Accessory for the 65LM hard wired keyless, 422LM & 423LM coaxial receivers. If your garage door opener has only 2 terminal connectors and no external 24-volt power supply, then this transformer is needed. For use with all types of add-on wire-in gate and garage door opener receivers. Plugs into standard 120-volt outlet.