Batteries - 1 Lithium Metal batteries required. (included) Item model number - MQD32LL/A Screen Size - 13.3 inches Processor Brand - Intel Processor Type - Core i5 Processor Speed - 1.80 GHz Processor Count - 1 RAM Size - 8 GB Computer Memory Type - DDR3 SDRAM Hard Drive Size - 128 GB Hard Drive Interface - eSATA Graphics Card Interface - Integrated Wireless Type - 802.11abg Rear Webcam Resolution - 2 MP Card Reader - SDXC Hardware Platform - Mac Operating System - Mac OS Lithium Battery Energy Content - 54 watt_hours Lithium Battery Packaging - Batteries contained in equipment Lithium Battery Voltage - 25 volts Lithium Battery Weight - 100 Grams Number Of Lithium Ion Cells - 1 Number of Lithium Metal Cells - 4