The Microsoft Surface Model 1661 Docking Station in Black is a compatible accessory for various Microsoft Surface laptops, including the Surface Book 2, Surface Book, Surface Laptop 2, Surface Go, and more. It features ports for audio out, mini displayport, Ethernet (RJ-45), and USB 3.0, as well as a built-in USB port. The docking station is made of rigid plastic and has dimensions of 5.12 inches in length, 1.18 inches in height, and 2.36 inches in width. With passive cooling capabilities, this docking station is a practical and essential accessory for expanding the connectivity and functionality of your Microsoft Surface laptop.