0, 4 USB 2.0), two HDMI for exterior monitors, and gigabit Ethernet. The dock is usually laid flat around the desk or stood up vertically, and it conveniently has individual ports to get a microphone and headphones within the front. What's excellent in regards to the UD-3900C is always that https://supertop-shop.com/usb-hub-with-3-ports-and-ethernet-connector/