1.6 GHz dual-core Intel Core i5 (Turbo Boost up to 2.7 GHz) with 3 MB shared L3 cache
8 GB of 1600 MHz LPDDR3 RAM; 128 GB PCIe-based flash storage
13.3-Inch (diagonal) LED-backlit Glossy Widescreen Display, 1440 x 900 resolution
Intel HD Graphics 6000
OS X El Capitan, Up to 12 Hours of Battery Life
Macbook Air does not have a Retina display on any model.