ASUS X551 15.6-inch Laptop (Intel Celeron 2.16GHz Processor, 4GB RAM, 500GB HDD, Windows 8.1 includes Windows 10 upgrade), Black Intel Celeron N2830 Dual Core Processor (1M Cache, up to 2.41 GHz) 4GB DDR3L-1333 RAM, 500GB 5,400RPM Hard Drive 15.6" 16:9 HD (1366x768) display 1 USB 3.0, 1 USB 2.0, Integrated SD card reader, No Optical Drive Weights 4.74 lbs, up to 4 Hours battery life. Maximum expandable Ram memory: 4 GB