2.9GHz Quad-Core Intel Core i7 (Turbo Boost up to 3.8GHz), 16GB of 2133MHz LPDDR3 memory, Retina Display, 15.4" (diagonal) LED-backlit display with IPS technology, Bluetooth 4.2, 720p FaceTime HD camera, Built-in 76.0-watt-hour lithium-polymer battery
2.9GHz Dual-Core Intel Core i5 (Turbo Boost up to 3.3GHz), 16GB of 2133MHz LPDDR3 memory, Retina Display, 13" (diagonal) LED-backlit display with IPS technology, Bluetooth 4.2, 720p FaceTime HD camera, Built-in 49.2-watt-hour lithium-polymer battery
3.0GHz 8-Core Intel Xeon E5, Turbo Boost up to 3.9GHz, 64GB (4x16GB) 1866MHz DDR3 ECC SDRAM, 256GB PCIe-based flash storage, 802.11ac Wi-Fi, Bluetooth 4.0, USB 3.0, Thunderbolt 2, Keyboard and mouse not included
512GB PCIe-based onboard flash storage, 1.2GHz dual-core Intel Core m5 processor Turbo Boost up to 2.7GHz, 8GB Memory, Intel HD Graphics 515
iPad Air 2 is an impossibly thin 6.1 millimeters, making it the thinnest iPad ever. And it weighs less than a pound. So it's even easier to hold in one hand and take with you anywhere.