The Lenovo DK2131 ThinkPad Thunderbolt 4 Workstation Dock is a black docking station made of rigid plastic. It is compatible with various Lenovo ThinkPad models and universal laptops with 14-15 inch screens. The dock features multiple ports including HDMI, USB 3.0, USB 2.0, USB-C, DisplayPort, Ethernet, and Audio Out. It also has built-in USB ports, anti-slip features, and is AC-powered. The item measures 10.6 inches in length and 3.3 inches in height.