Lenovo ThinkPad Yoga (20CD00CHUS) 12.5-Inch Laptop (Black) I5-4200U, 4GB, 500GB 7200 rpm, Windows 8.1 Pro 64. Intel Core i5-4200U 1.6 GHz 4 GB DDR3 500 GB 7200 rpm Hard Drive, 16 GB Solid-State Drive 12.5-Inch Screen, Integrated Windows 8.1 Professional, 7-hour battery life