ASUS E502MA BIOS Processor Intel® Bay Trail-M Dual Core Celeron N2840 Processor Intel® Bay Trail-M Quad Core Celeron N2940 Processor Intel® Bay Trail-M Quad Core Celeron N3540 Processor Operating System Windows 8.1 Memory DDR3 1333 MHz SDRAM, GB, OnBoard Memory 2 GB / 4 GB Display 15.6" Auto HD (1366x768) Storage - 500GB HDD 5400 - 750GB HDD 5400 - 1TB HDD 5400 - 32GB eMMC Card Reader 3 -in-1 card reader ( SD/ SDHC/ SDXC) Camera VGA Web Camera Networking Integrated 802.11 b/g/n Built-in Bluetooth™ V4.0 10/100 Base T Interface 1 x COMBO audio jack 1 x VGA port/Mini D-sub 15-pin for external monitor 1 x USB 3.0 port(s) 1 x USB 2.0 port(s) 1 x RJ45 LAN Jack for LAN insert *1 1 x HDMI Audio SonicMaster Battery 2Cells 32 Whrs Power Adapter Output : 19 V DC, 3.42 A, 33 W Input : 110 -240 V AC, 50/60 Hz universal Dimensions 38.3 x 25.8 x 22.1 cm (WxDxH) Weight 1.86 kg (with 2 cell battery) Security Kensington lock BIOS Booting User Password Protection Manufacturer Warranty 2-year limited International hardware warranty. *different by country