Dell Latitude E6420 Core i5-2520M 2.5GHz 4GB 250GB DVD&plusmn;RW NVIDIA Optimus 14" LED Laptop Windows 7 Professional w/6-Cell Battery Dell Latitude E6420 Core i5-2520M 2.5GHz 14-inch Laptop General Features: Anodized aluminum display back, Tri-Metal design Microsoft Windows 7 Professional pre-installed w/CoA 6-cell Lithium-ion battery Intel Core i5-2520M 2.5 GHz dual-core processor 3 MB Intel Smart Cache, 5 GT/s DMI speed Intel QM67 Express chipset