Compaq Presario CQ56-115DX AMD V-Series processor V140* 2GB DDR3 memory expandable to 8GB. Multiformat DVD¡¾RW/CD-RW drive with double-layer support 15.6" LED high-definition displayd 1366 x 768 resolution 250GB Serial ATA hard drive (5400 rpm) ATI Mobility Radeon HD 4250 graphics Feature up to 893MB total video memory . wireless LAN (802.11b/g/n) Weighs 5.6 lbs.= 2.5Å°·Î and measures just 1.5" thin 6-cell lithium-ion batter up to 4 hours and 15 minutes Microsoft Windows 7 Home Premium Edition 64-bit