At Box's AV Extender over CAT5 allows users to extend audio and video signals up to 500 ft. using CAT5 cables.  The single port version comes complete with one transmitter and one receiver unit.  The product also works with most video splitters in the market, which allows video broadcast to mulitple screens.

At Box's 5 port AV distribution amplifier allows users to extend audio and video signal up to 500ft over Cat5 cable. It comes complete with one transmitter (distribute AV signals on 5 CAT outputs) and one receiver that supports up to 5 pairs of audio and VGA equipment.