Lightning Switch&reg; On/Off Transmitter -- Long Range (60-75 ft.) Transmission Amazing New Batteryless / Wireless Controls for Light Switches & Small Appliances Transmits On and Off Codes 60-75 ft. through Walls, Doors, Floors, etc. The Transmitter to Use to Control 2+ Receivers as a Group or to Control Receiver(s) You Can't See Installs in Seconds - Easiest to Use and Most Versatile Home Control Ever Introduced Uses Patented NASA Technology to Power RF Control Signal without Battery or AC Power Source