The U244-001-R USB 2.0 to DVI/VGA External Video Graphics Card Adapter displays video on a DVI or VGA 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. The adapter is an ideal tool for multitasking, viewing large spreadsheets, editing documents, giving presentations at trade shows or watching movies and playing games on large screens.You can add up to six U244-001-R 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. First, install the drivers using the included CD. Then, connect the adapter to the display and the source using a DVI or VGA cable and the included USB 2.0 cable, respectively. A DVI-to-VGA adapter is also included for connecting to a VGA cable.The U244-001-R supports high-definition video resolutions up to 1920 x 1080 (1080p) @ 60hz and features 128 MB DDR SDRAM of memory. Compatible with 32- and 64-bit Windows 7 and later, as well as 32- and 64-bit Intel Mac OS X 10.8.3 and later / Mac 10.11. Compatible with Ubuntu 14.04.2. The adapter also works with Surface tablets running Windows 8 Pro or later / Windows 10.1-Year-Limited Warranty 3-year limited warranty