1)You want to connect several units of audio-video equipment,but there is a lack of television input    signal source terminals,The signal connection wires are often plugged and unpluggde,which is very inconvenient.
2)The kids at home wants to connectseveral units of television game players and use simultaneously, you may switch 4-group AV audio-video signal input and 1-group output to the television.DVD,VCD,TV,Game, VCR station selector,satellite TV, cameras,etc, Directly exposed manual switch over,design of no connection to power,quick install-ation and convenient application.