Apple USB C To HDMI Multiport Adapter with 4K@60Hz HDMI Port & USB 3.0 Port & USB-C Charging Port. 3 Ports Can Work At The Same Time.
Mirror and Extend Mode Settings:
For MacOS, Top left corner Apple icon - System Preferences - Displays Mirror or Extend Displays;
For Windows 10, press Windows key + P combination command - choose Duplicate or Extend.
For Windows system laptop, if the external monitor could not work, please update the BIOS and graphic card driver from laptop official website.