Microsoft Surface Dock Compatible with Surface Book, Surface Pro 4, and Surface Pro 3 (Certified Refurbished) Microsoft Surface Dock (Compatible with Surface Book, Surface Pro 4, and Surface Pro 3), 2x Mini Display Ports 1x Gigabit Ethernet Port, 4 USB 3.0 ports 1x Audio out port, Magnetic Surface Connect Cable High-Speed Data Transfering, Lightning fast with minimalist design Easy to setup, Interface : Super Speed USB 3.0, Audio, Display / Video, Network, Ethernet 10 Base T / 100 Base TX/ 1000 Base T, Mini Display Port, Line Out