0, four USB two.0), two HDMI for exterior screens, and gigabit Ethernet. The dock can be laid flat around the desk or stood up vertically, and it conveniently has independent ports to get a microphone and headphones about the front. What is actually good concerning the UD-3900C is the fact https://socialioapp.com/story130380/usb-hub-with-3-ports-and-ethernet-connector-no-further-a-mystery