The ST121UTPGB VGA video extender over Cat 5 means that you can extend your VGA video signal by up to 130 meters (430 feet) & connect up to 4 displays (2 local & 2 remote) from that single source. The ST121UTPGB is a bundled kit including both a local transmitter & a remote receiver unit, offering a complete solution for scenarios in which remote monitor displays are required. The local unit features a single VGA input as well as two VGA outputs giving you the ability to view & split your source VGA signal to two independent displays locally. The VGA video signal is then sent over standard 4 pair category 5 or better UTP cable to the remote unit which also features two additional VGA outputs giving you the freedom to display your VGA source on up to four monitors in total.