Audio/video signal switcher.
Not sure why I bought this, but I must have had a reason.
It's used to switch an audio/video signal between four different devices from a single source. For instance, if you have a plain jane vcr that you might want to switch between found different TVs, you could use this switcher to do that rather than wrestling with cables.....
![Shrug01](images/smilies/shrug01.gif)
You could also use it for some sort of security monitors as well...
Asking $25.