Changdong Portable Car Charger Power Supply Adapter for Microsoft Surface Pro 3 Intel Tablet(Car charger) Specially design for Microsoft Surface Pro 3 / Pro 4 Intel i5 i7 Core - Do Not fit Surface Pro 4 Intel M3 Core. 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. Note:this car charger does not design with usb charge port.