Acer Aspire E1-531-2697 15.6 LED Notebook Intel Celeron B820 1.70 GHz 4GB DDR3 320GB HDD DVD-Writer Intel HD Graphics Windows 7 Home Premium 64-bit Black Microsoft Windows 7 Home Premium 64-bit Edition 15.6 LED Notebook Intel Celeron B820 1.70 GHz 4GB DDR3 320GB HDD DVD-Writer Intel HD Graphics webcam 2 x USB 2.0  HDMI  VGA  LAN  Headphone output  Microphone input Battery: 6-cell lithium ion Run Time: Up to 4 hours