Sold as 1 Each. Universal docking station has VESA mounting plate that facilitates easy dock placement on the back of an external monitor. Requires Windows 10/7/8/8.1. Four rear USB 2.0 ports for peripheral accessories like a keyboard and mouse. Gigabit Ethernet port is suitable for wired connectivity to a network or the Internet. Comes in black color. Kensington security slot and zero footprint mounting included. VESA mounting plate permits taking off the dock from the desktop. With a universal dock, you can disconnect and reconnect your dual HD monitors, mouse, keyboard and all other peripherals with a single USB cable. Compatible with laptops, ultrabooks and tablets. Allows Dual 1080p HD video to external monitor via HDMI, VGA or DVI. Display settings software permits you to easily make changes to preferences. Dock easily mounts to the back of a monitor, leaving zero footprint on desktop. Two USB 3.0, four USB 2.0, one RJ-45 Ethernet (LAN) female, two HD 1080p, DVI out, DVI-I to