Displays video on a VGA or DVI monitor or projector via your computer or laptop?s USB 2.0 port. You can extend video from your primary display to another, duplicate the same video on both displays or change the second display to your primary display. Supports high-definition video resolutions up to 1920 x 1080 (1080p) @ 60hz. You can add up to six adapters, each attached to its own USB 2.0 port, to connect a total of seven displays to the video source. Adding or removing a monitor is easy?no need to reboot the system afterward. No external power supply is necessary.