Microsoft 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, Surface Laptop 1/ Laptop 2/ Laptop 3, Surface Pro X/ Surface Pro 7/ Surface Pro 6/ Surface Pro 5/ Surface Pro 4/ Surface Pro 3, Surface Go 2/Surface Go 1. Design with Automatic thermal, overload cut-off, and short circuit protection. Ensure the safety during the using