XINGDONGCHI Magnetic Car Charger Power Supply Adapter for Microsoft Windows Surface Pro 3 / Surface Pro 4 Intel i5 and i7 Core Suitable for Microsoft Surface Pro 3 / Surface Pro 4 Intel Core i5 and i7 Tablet.Not fit Intel Core M3 Charge your surface pro3 in the car, convenient for travelers and business users. Circuit Protection : Short Circuit Protection and Overload Protection Interface: Microsoft Pro3 dedicated magnetic suction interface and not design with usb charge port. Designed to meet or exceed your original manufacturer's ac adapter