Xiemin Portable Power Adapter Car Charger for Microsoft Surface Pro 3 12 Inch Tablet with a 5v 1a USB Port (Pro 3 Car Chager with USB) Fits for Microsoft Surface Pro 3 12 Inch Tablet I/C Chip technology prevents your tablet's battery overcharging. Specially designed with a USB port for you to charge for other device while using your pro 3 tablet. Easy to carry around, on trip and travel. Input:12V-24V.Output:12V2.58A.Weight:0.19kg.