Winwintrade Magnetic Cable Cord Power Bank Charging Cable for Microsoft Surface PRO 3/PRO 4 100% Brand new and high quality.suitable for surface pro 3/ Surface Pro 4 Intel Core i5 i7 Tablet(Not Fit for Surface RT/ Pro/ Pro2 and surface pro4 Intel Core M3 NOTE: ONLY for 12V 2.5A mobile power supply!!! No USB port! This cable fit for your surface PRO 3 /PRO 4 tablet inned copper / Electromagnetic Immunity / high speed charge / short circuit protection / over-voltage protection / over-voltage protection Suitable for DC plug size: 5.5*2.5mm; Please use Formal mobile power bank to charge your tablet pc!!