Input: 100-240V 50/60 Hz ; Output:15V-4A 65W Additional USB Port: 5V-1A 5W. Replacment for Microsoft charger with model 1706(65W 15V 4A),Model 1800 (44w 15V 2.58A),Model 1625 (36W 12V 2.58A),Model 1735 1736(24w 15V 1.6A). Fit for Microsoft Surface book,Surface Pro 3,Surface Pro 4,Surface Pro 5,Surface Pro 6 Surface Laptop 2,3, Surface Pro (2017) and Surface Book. (NOT for Surface 3, Surface 2, pro 1/2 or Surface RT),The USB port allows you to charge another device such as your phone at the same time.