This four port VGA switch allows you to use one monitor with up to four different PCs or Mac computers. The simple one-button design allows you to choose which computer is being displayed on the monitor at a given time. An LED indicator lets you know which one has been selected. This sturdy blue VGA switch box comes equipped with its own power supply for quick and effective operation. Simply plug a VGA monitor cable into the output and connect the computers to the VGA inputs, plug in the power adapter and you're off and running!