XINGAN 12V/2.58A Cigarette Lighter Power Supply Adapter Portable Replacement Car Charging Unit for Microsoft Surface Pro 3/Pro 4 Tablet Accessories Compatible with Microsoft Surface Pro 3 / Pro 4 Intel i5 i7 Core. I/C Chip technology prevents your tablet's battery overcharging. It is convenient for you to charge for your tablet when you are in travel. Specially design for Microsoft Surface Pro 3 / Pro 4 Intel i5 i7 Core - Do Not fit Surface Pro 4 Intel M3 Core. Note:this car charger does not design with usb charge port.