DOES NOT WORK WITH Surface Pro 4, Surface Pro 3 and Surface Book (1st Gen). Made for Surface Book 3 (13.5" and 15"), Surface Pro 7, Surface Pro X, Surface Laptop 3 (13.5" and 15"). Supports dual 4K monitors at 30 Hz: Surface Go 2, Surface Pro 6, Surface Pro (5th Gen), Surface Laptop 2, Surface Laptop (1st Gen), Surface Go and Surface Book 2 (13.5" and 15").Bring more power to your laptop. Surface Dock 2 transforms your Surface into a desktop PC, with a 199 W power supply to charge most Surface devices, plus USB-C ports that support dual 4K monitors at 60 Hz. Simply plug in the Surface Connect cable to charge your device and access external monitors, a keyboard, mouse, and more.