USB-C to Dual HD Portable Dock. Get more out of your new USB-C or Thunderbolt 3 laptop with the USB-C to Dual HD Portable Dock. Create a dual HDMI monitor1 workstation to expand your productivity and efficiency. The Portable Dock provides a USB type-A port for use with a keyboard, mouse, hard drive or printer and is the ideal companion for quick, easy connectivity while on-the-go.