Remote control systems and components thereof, namely radio controls for garage and warehouse entrance doors or gates, automatic garage door openers, lights, motors, antennas, transmitters, receivers and controllers responding thereto and used in such systems; electric door operators; electric gate operators; electrical safety equipment, namely, an electric eye for sensing obstructions and controlling doors; electronic security devices, namely, electronic controls for granting access and egress through doors or gates; Radio receiver units, radio transmitter units, keypads and card readers; a centralized automated system comprising a programmable controller, power line carrier modules, and one or more control modules or control receptacles, for controlling audio equipment, lighting, and other appliances in a residence; access control systems, comprising speakers, microphones, memories for storing telephone numbers and corresponding code numbers, electric luminescent display panels and liquid crystal display panels, keypads, autodialers, gate/lock control circuitry and vandal resistant housings, for establishing communication between persons in a secured location and persons desiring to enter the secured location through a locked gate or door