Display: Retina display: 13.3-inch (diagonal) LED-backlit display with IPS technology Processor: 2.4GHz dual-core Intel Core i5 processor (Turbo Boost up to 2.9GHz) 2.5GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.1GHz) 2.6GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.2GHz) Memory: 4GB or 8GB of 1600MHz DDR3L onboard memory Storage: 128GB flash storage 256GB flash storage 512GB flash storage Graphics: Intel HD Graphics 4000 or Intel Iris Graphics Wireless: Wi-Fi 802.11n or 802.11ac Bluetooth 4.0 Battery: Up to 7 hours wireless web Other: 720p FaceTime HD camera Backlit keyboard with ambient light sensor HDMI port Headphone port