This high performance device will modulate video and left/right audio signals of a VCR, satellite receiver, or security camera to UHF or CATV selected channels. This installer friendly modulator is frequency agile and allows the signal to be placed on any free Output Channels: UHF Channels 14-78, CATV Channels 65-94 and 100-135. Simply push a button to select a channel. An easy to read LED display shows the channel that is selected. When used with a front door camera, the MOD1 allows you to see who is at the front door from any TV in the house by conveniently changing to the modulated channel. (Note: The audio signal is the left and right combined, therefore it is not a true stereo modulator.)