[ddouglass]

George I hate to tell you this but that is not a wireless system. It is a way to allow you to use unshielded twisted pair wire (cheaper) to run your SVideo to distant TVs. A "Balun" is like a transformer used to block out unwanted signal (noise) from the cheap wire to prevent that noise from entering the TV. Since that wire is not shielded then it will pick up extraneous noise from florescent lights, etc. This prevents those noises from showing on the screen.
There are wireless systems available but you won't find one that cheap. I have used wireless speakers but not for Karaoke and was less than please with them, but that was several years ago.