It connects to your Mac via an integrated Thunderbolt 3 cable. While you'll only be using one of the HDMI ports, it can output 4K video and connect two more devices. The OWC mini dock has two HDMI ports, one USB 3 Type-A port, one USB 2 Type-A port, and a Gigabit Ethernet port. It has a Displayport, HDMI, USB 3.1 Gen 1 Type-A, and a Gigabit Ethernet port.
The Elgato Mini Dock has four basic ports for your convenience and an integrated cable for improved portability.
