Dual HDMI to USB CThis dual HDMI adapter for 2 monitors features two HDMI ports, allowing you to connect two monitors simultaneously for extended or mirrored displays. Whether for work, entertainment, or creative tasks, dual-screen setup greatly enhances productivity and visual experience, catering to your multitasking needs. (Note: macOS devices do not support MST mode when connecting 2 monitors, both monitors can only display the same content (A-A-A/A-B-B)) Dual 4K Ultra HDWhen using a single HDMI port, the HDMI dual monitor adapter supports up to 4K@60Hz video output resolution, providing clear, smooth visuals perfect for watching HD movies, gaming, or content creation. When connecting both HDMI ports, the resolution is 4K@30Hz, still delivering excellent visual quality, ideal for daily office work or video conferencing. (NOTE: Only when your devices support 4K resolution, the video output will be 4K,please make sure to use a HDMI 2.0 cable or better)