Apple MacBook Pro MC371LL A 15.4" Intel Core i5 520M 2.40GHz 4GB 320GB Mac OS X v10.8 Mountain Lion Size:15.4" Memory Configuration 2 x 2GB Memory Configuration 2 x 2GB Memory Speed MHz 1333MHz Memory Speed PC3 10600 Memory Type DDR3 Mouse Type HP mouse Operating Systems Windows 7 Home Premium 64 Bit Optical Drive Class DVD SuperMulti Optical Drive Type Supermulti Slimslot DVD drive with LightScribe drive Optical Drives Included 1 Orientations Allowed Vertical PCI Express Slots (Available) 1 PCI Express Slots (Total) 1 PCI Express X1 Slots (Available) 0 PCI Express X1 Slots (Total) 2 mini x1 slots Platform PC Power Supply Type 100V 240V Power 200 Watt Processor Brand AMD Processor Class Athlon II X2 Processor Number 235e Processor Speed 2 Features: Backlight Pointing Device TouchPad with Multi Touch Control Battery Lithium Ion Providing up to 4 Hours per Charge (2670mAh) Power Requirements Not Specified By Manufacturer Dimensions (WxHxD) 13 Mac OS X 10 Exterior Condition: Grade A due to one tiny scuff at the back of the unit and a small scratch on the top