Apple 13.3" Macbook Pro MD101 Laptop (2.5Ghz Core i5 CPU, 4GB RAM, 500GB HDD, DVDRW, MacOS X El Capitan) 2.5GHz Dual-Core Intel Core i5 Processor (Turbo Boost up to 3.1GHz) 4 GB DDR3 RAM; 500 GB Hard Drive; Internal SuperDrive DVD-RW Burner (only Macbook with built-in DVD drive available now) 802.11n WiFi and Bluetooth 4.0; Dual USB 3.0 Ports and Thunderbolt Port 13.3" LED-backlit display, 1280-by-800 resolution, Intel HD graphics 4000 Mac OS X 10.11 El Capitan (free upgrade to macOS Sierra)