Crystal-Clear 4K HDMI Output: Make your life more colorful - Mirror or extend your screen with the USB C adapter’s HDMI port and directly stream 4K UHD or Full HD 1080p video to HDTV, monitors, or projectors for a cinema-like visual feast.When the HDMI and VGA output ports work simultaneously, the display will ONLY duplicate and NOT extend but the maximum resolution of both ports is 1080P.