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The VSM-3/4S is a single channel audio/video signal modulator that is designed to convert the separate audio and video signals from various video components such as video cameras, VCRs, DVD Players, or game consoles into a single VHF signal appropriate for viewing on most television sets. The unit also provides inputs for your S-VHS and antenna or cable TV signals to pass through to the output. When a video signal from your video component is present, the unit will bypass the cable/antenna input and allow the signal from you component to be viewed on channel 3 or 4. When your video component is not being used (there is no signal present) the unit allows for normal viewing of your cable/antenna signal.