Microsoft Surface Dock (PD9-00003) 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