Lenovo ThinkPad X220 42872WU 12.5-Inch Notebook Computer (Intel Core i5-2520M,4GB RAM, 320GB HD, Windows 7 Professional), Black Vibrant 12.5" WXGA HD anti-glare LED backlit 16:9 Widescreen; Windows 7 Professional 64-bit; Intel i5 2.5GHz up to 3.2GHz; 320GB fast Hard Drive; 4GB fast DDR3 PC3 RAM; Intel HD Graphics 3000; 720p HD Webcam; HD Audio; ThinkLight; SecurityChip; Magnesium Aluminum allow roll-cage chassis; Bluetooth; Wireless N; Gigabit Ethernet; 2 USB 2.0 Ports; 1 PoweredUSB 2.0; DisplayPort; AC Adapter; Lithium Ion Battery