USB audio/video converter uses an available USB port on your computer to connect an HDTV, monitor or projector with HDMI; adds an additional display when the other video ports on your computer are occupied; an HDMI cable (sold separately) is required. USB 3.0 to HDMI adapter leverages superspeed USB 3.0 bandwidth up to 5 Gbps for the best performance; functions like an external graphics card to deliver smooth high definition video to your HDTV or monitor; supports video resolutions up to 2560×1440 with HDMI and up to 1920×1200 with DVI; supports flawless audio pass thru for dolby true hd, dts master audio and more; backwards compatible with usb 2.0. portable USB to HDMI adapter with a bonus travels easily in a laptop bag; included HDMI to DVI adapter provides an additional USB to DVI connection option for display with only DVI for video only; ideal solution for surface pro or macbook air users that need to connect to a projector or monitor when traveling. Simple installation plug and play. No external power required with USB bus power. Windows and Mac compatible with Windows 10/8.1/7/vista/XP and Mac os x 10.11/10.10/10.9/10.8 (audio and video) 10.7/10.6/10.5 (video only).