The Gefen 1:4 VGA Hub allows a computer with a VGA graphic card to connect to up to four VGA compatible monitors or projectors at the same time. Because it allows one computer to drive multiple monitors for simultaneous viewing, you can use it to set up additional monitors in the workspace, or to assist presentation environments by sending graphics to both monitors and projectors at the same time. You simply connect your computer's VGA graphic port to the 1:4 VGA Hub's input using the supplied cable. Up to four analog monitors or projectors are connected to the Hub's four VGA outputs. VGA output 1 is the primary connection and is used for the main display. VGA output 2, 3 and 4 will mirror the primary connection. Package Includes: 1:4 VGA Hub, One 6ft VGA cable (M-F), 5V external power supply.