aoeyoo&reg; USB 3.0 to HDMI/ DVI External Video Card-HDMI Display Extender Multi Monitor Adapter USB 3.0 port into an HDMI output, with high resolution 2048 X 1152 video support Add a secondary HDMI or DVI display and extend your desktop without taking apart your computer to install a new video card Choose between Mirrored, Extended or Primary display configurations Only support USB 3.0 Port!!!!Notice: For better resolution, we recommend user using this 3.0V UGA via the USB3.0 port instead of USB2.0/ USB1.1, it will degrade to resolution to 800*600 via the USB2.0/1.1 Port USB3.0 port will support upto full HD 1080P. No external power adapter required