Microsoft Surface Dock (Compatible with Surface Pro 3, Surface Pro 4, and Surface Book) Compatible With Surface Pro 3, Surface Pro 4, Surface Book, Surface Pro, and Surface Laptop 2x Mini Display Ports, 1x Gigabit Ethernet Port 4 USB 3.0 ports, 1x Audio out port Magnetic Surface Connect Cable. Transform your Surface into a desktop PC by plugging in your Dock with the SurfaceConnect cable High-Speed Data Transfering