The ST121R VGA over Cat5 Video Extender Receiver is specifically designed for use as the receiver unit to the StarTech.com ST1214T 4 Port, and ST1218T 8 Port VGA over Cat5 UTP Extender transmitter units, 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 ST121R 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.Backed by a StarTech.com 2-year warranty and free lifetime technical support.