0, 4 USB 2.0), two HDMI for external displays, and gigabit Ethernet. The dock can be laid flat to the desk or stood up vertically, and it conveniently has different ports for just a microphone and headphones over the entrance. What's fantastic in regards to the UD-3900C is usually that https://supertop-shop.com/usb-hub-with-3-ports-and-ethernet-connector/