Display : 21.5-inch (diagonal) LED-backlit display with IPS technology; 1920×1080 resolution with support for millions of colours. | Processor : 2.8GHz 2.8GHz quad-core Intel Core i5 (Turbo Boost up to 3.3GHz) | Memory : 8GB of 1867MHz LPDDR3 onboard memory | Storage : 1TB (5400-rpm) hard drive | Graphics : Intel Iris Pro Graphics 6200 | Video Support and Camera : FaceTime HD camera Simultaneously supports full native resolution on the built-in display and up to 4096×2304 pixels on an external display. | Audio : Stereo speakers, Dual microphones, 3.5mm headphone jack, Headphone/optical digital audio output (mini-jack), Support for Apple iPhone headset with microphone. | Connection and Expansion : 3.5mm headphone jack, SDXC card slot, Four USB 3 ports (compatible with USB 2), Two Thunderbolt 2 ports, Mini DisplayPort output, Support for HDMI, DVI, VGA and dual-link DVI (adapters sold separately), 10/100/1000BASE‑T Gigabit Ethernet (RJ-45 connector), Kensington lock slot, Support for extended desktop and video mirroring modes. | Wireless : Wi‑Fi – 802.11ac Wi‑Fi wireless networking, IEEE 802.11a/b/g/n compatible, Bluetooth – Bluetooth 4.0 wireless technology. | OS X El Capitan – Engineered to take full advantage of your Mac hardware, OS X El Capitan is designed to be as easy to use as it is beautiful to look at. It comes with an amazing collection of apps you’ll use — and love — every day. And it enables your Mac and iOS devices to work wonderfully together.