XIEMIN Portable Power Adapter with USB Port Car Charger for Microsoft Surface Pro 3 12 Inch Tablet (pro 3 car chager-HT) Fits for Microsoft Surface Pro 3 12 Inch Tablet I/C Chip technology prevents your tablet's battery overcharging. Specially designed with a 5V 1A USB port for you to connect other device while charging for your pro 3 tablet. Easy to carry around, on trip and travel.