Cable Matters USB to HDMI Adapter (USB 3.0 to HDMI Adapter/USB 3 to HDMI Adapter) Supporting 4K Resolution for Windows USB VIDEO GRAPHICS ADAPTER uses an available USB 3.0 port on a computer to connect a UHD TV, monitor or projector with HDMI; Add an additional display when the other video ports on your computer are occupied; An HDMI cable (sold separately) is required 4K VIDEO RESOLUTION up to 3840 x 2160 @ 30Hz with compatible equipment; Backwards compatible to 720, 1080p MONITOR MULTI-TASKING with this USB to HDMI adapter that supports Extended or Mirrored Display modes; Functions like an external graphics card to deliver vibrant video over HDMI 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); Currently NOT COMPATIBLE with macOS 10.12 Sierra) WINDOWS AND MAC COMPATIBLE with Windows 10/8.1/7/Vista/XP and Mac OS X 10.10/10.9/10.8 (audio and video) 10.7/10.6/10.5 (video only)