1. Designed for Microsoft Surface Laptop (2017) & Surface Pro,compatible with Microsoft Surface Book / Surface Pro3 / Surface Pro4 / Pro5/ Pro 6/ Surface Go 2. Input: AC 100-240V (Worldwide use) Output: 15V 2.58A 44W. USB Port: 5V 1.5A USB 2.0. Power Supply quickly recharges the battery and the USB port allows you to charge another device such as your phone at the same time. 3. Our products are UL, FCC, RoHS certified for safety, manufactured with the highest quality materials,Provides overcharge Protection System/Short circuit/Overload protection/Over-heat protection