Part#: LX.V4N03.223 Operating System: Windows 7 Professional 32-bit/64-bit Dual Hotload Optical Drive Type: DVD-RAM/±R/±RW Resolution: 1366 x 768 Memory Speed: DDR3 1066 WLAN: 802.11a/g/n Wireless LAN Bluetooth: Bluetooth 2.1 Battery: 6-cell lithium ion