Surface Charger Input: 100-240V 50/60 Hz ; Output:15V-4A 65W Additional USB Port: 5V-1A 5W. The USB port allows you to charge another device such as your phone at the same time Designed for Microsoft Surface Book, Microsoft Surface Pro 3 and Microsoft Surface Pro 4 , match surface model 1706, 1866, 1796, 1724, 1625, 1867, 1735, 1800 and so on Design with Automatic thermal, overload cut-off, and short circuit protection. Ensure the safety during the using Package Contents - 1 x 65W power adapter, 1 x power supply cord