Acer Aspire 5742Z-4200 Intel Pentium P6100 2.0GHz 2GB 250GB DVDRW WebCam 15.6" W7 Home Black LXR4P02002 Operating Systemwindow 7 Home Premium 64-bit CPU: Intel Pentium dual-core P6100 2.0G Memory Size: 4GB DDR3 Hard Disk 320GB, DVD Super Multi Screen Size: 15.6" (1366x768) 1.3Mp Webcam 6-cell Li-ion Battery (4400 mAh) Weight : 5.74 lbs.