The USB2VGAE3 USB VGA Multi-Monitor External Video Adapter lets you add a high-resolution (1920x1200) external VGA output to your desktop or laptop computer, using an available USB 2.0 port.A cost-effective solution for systems that lack the outputs required for a multi-monitor setup, this high-performance USB to VGA adapter can be used to mirror your primary display and show the same image on both screens, or extend your desktop to double your workspace.This small form factor USB video adapter can be used with up to 4 additional (5 total) USB2VGAE3 USB video adapters, creating multiple VGA connections to add displays quickly and easily - all without having to open the computer case to add extra video cards.