The JUA254/255 USB to HDMI Multi-Monitor Adapter works as an external video card, instantly allowing users to attach additional displays via HDMI connection without the hassle of a lengthy setup or having to install additional hardware. The USB 3.0 Display Adapter can support up to four displays running on the same computer, turning your workstation into a fully-functioning, multi-display powerhouse. This USB adapter works as an external video card, instantly allowing additional displays without the hassle of opening the computer casing and installing an external graphics card. You can have a second monitor with an extended display, a mirrored display, a rotational display (rotation mode not available for Mac ), or make it your primary monitor. Now enjoy true 1080p HD resolution through any Windows or Mac computer with a USB 3.0 port. These adapters are also backwards compatible with USB 2.0 resolutions and playback, which are ideal for office applications. The simple plug-and-play function allows you to connect your computer to a second monitor or projector within seconds to create a new visual environment on Windows 10.