The ST121RGB VGA over Cat5 video extender receiver is specifically designed for use as the receiver unit to the StarTech.com ST1214TGB 4 port VGA over Cat5 UTP Extender transmitter, allowing you to split and extend a single VGA source to up to four remote displays. From the transmitter device, the VGA video signal is sent over standard 4 pair category 5 or better UTP cable to remote monitors, each connected to an ST121RGB Cat 5 VGA receiver - supporting distances of up to 150 meters (500 feet). A cost-effective video extension solution, this receiver is ideal for a wide range of environments including airports, bus depots, retail, or any large buildings where VGA video needs to be extended to long connection distances.