Lenovo ThinkPad Edge E550 20DF0030US 15.6-Inch Laptop (Black) Intel Core i5-5200U Dual-Core 2.2 GHz (3 MB Cache) with 2.7 GHz Max Turbo 15.6-Inch HD (1366x768) anti-glare Screen, Intel HD Graphics 5500 4GB (16GB Max) DDR3L-1600 SDRAM, 500GB 7200rpm SATA 6.0Gb/s Hard Drive, DVD-Writer Intel Wireless-AC 3160, 1x1, Wi-Fi + Bluetooth combo adapter, Gigabit Ethernet Windows 7 Professional 64-bit pre-installed (Upgradeable to Windows 8.1 Pro 64-bit)