Accepts up to 8 Security+® remote control codes. With built-in transformer; 315 MHz; Compatible with all LiftMaster Security+®. Plugs into standard polarized 120V, 60Hz AC outlet. Includes 2-conductor bell wire. Hardwires directly to garage door opener strip. Built-in control button; Momentary contact closure. 5-amp relay contact; Power indicator light. Smart Garage Door Opener® receiver for easy programming with the push of a button