Lenovo ThinkPad Edge E550 20DF002YUS 15.6-Inch Laptop (Black) Intel Core i3-4005U 1.7 GHz (3 MB Cache) 4 GB DDR3L SDRAM 500 GB 7200 rpm Hard Drive 15.6-Inch Screen, Intel HD Graphics 4400 Windows 7 Professional 64-bit (upgradeable to Windows 8.1 Pro), 9-hour battery life