The IOGEAR USB 3.0 External DVI Video Card instantly adds an additional high resolution DVI display through your USB 3.0 port. Simply install the driver, plug the adapter into the USB 3.0 port and you're ready to go. Extends your desktop across an additional display, allowing you to increase your productivity like never before. While reading email on one display, open attachments on the other display, or expand spreadsheets across both monitors. In graphics programs you can increase your work area by putting all your pallets on the second display. Additionally, no power supply is needed as the USB 3.0 to DVI External Video Card is powered through the USB cable. o Easily connect additional DVI monitors to a USB 3.0 port. Extend or mirror your desktop with multiple monitors. Supportsresolutionsup to 2048x1152 at 32-bit color. Bus Powered - No external power supply needed. Add up to six external displays via USB 3.0 ports. Includes DVI to VGA and DVI to HDMI Adapter. Applications - Office Use: View large spreadsheets across two screens with display continuity. Multitask more effectively without overlapping windows. Open attachments on one screen while reading the e-mail on the other Graphic Use: Use second display for pallets & tools. Open projects across 2 screens. Data Entry Use: Type documents on one screen while viewing reference material on the other .Wall Street:Using a notebook you can add multiple screens Requiressix USB 3.0 ports. Not recommended to connect with USB hubs.