Display Retina display 15.4-inch (diagonal) LED-backlit display with IPS technology; 2880-by-1800 native resolution at 220 pixels per inch with support for millions of colors Supported scaled resolutions: 1920 by 1200 1680 by 1050 1280 by 800 1024 by 640 300 nits brightness Standard color gamut (sRGB) 900:1 contrast ratio Processor 2.2GHz2.2GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.4GHz) with 6MB shared L3 cache Memory 16GB of 1600MHz DDR3L onboard memory Storage 512GB PCIe-based flash storage Size and Weight Height: 0.71 inch (1.8 cm) Width: 14.13 inches (35.89 cm) Depth: 9.73 inches (24.71 cm) Weight: 4.49 pounds (2.04 kg) Graphics and Video Support Intel Iris Pro Graphics Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on up to two external displays, both at millions of colors Thunderbolt digital video output Native Mini DisplayPort output DVI, VGA, dual-link DVI, and HDMI output supported using Mini DisplayPort adapters (sold separately) HDMI video output Support for 1080p resolution at up to 60Hz Support for 3840-by-2160 resolution at 30Hz Support for 4096-by-2160 resolution at 24Hz Camera 720p FaceTime HD camera Wireless Wi-Fi802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible BluetoothBluetooth 4.2 wireless technology Audio Stereo speakers Dual microphones 3.5 mm headphone jack Support for Apple iPhone headset with remote and microphone Support for audio line out (digital/analog) Keyboard and Trackpad Full-size backlit keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted ldquo;Trdquo; arrangement) with ambient light sensor Force Touch trackpad for precise cursor control and pressure-sensing capabilities; enables Force clicks, accelerators, pressure-sensitive drawing, and Multi-Touch gestures Battery and Power Up to 9 hours wireless web (Actual battery performance span may vary) Up to 9 hours iTunes