The Leapfrog LF-30S is a wireless transmitter/receiver system that eliminates the need or expense of running extra wires from room to room. It gives you the power to control the video source from the second TV's location using your remote control. By transmitting across the 2.4 GHz frequency band it gives you the clearest signal -with up to a 150ft range. Its' signals penetrates walls, doors, ceilings and floors without any interference. Multiple channel selection allows you to select from four different channels to ensure that you're receiving the best signal possible. The LF-30S is easy to install requiring no tools. A built-in modulator ensures easy connection to any TV, either new or old. The LF-30S system is even expandable. With the purchase of additional receivers, you can use it with multiple TVs throughout your home.