Technical Specifications Operating system: Mac OS X 10.8, Mountain Lion Memory: 16GB memory upgrade (two 8GB) 1600MHz DDR3 memory Storage: 1TB (7200-rpm) HDD Optical drive: None Graphics: Intel® Iris Pro graphics Processor: Intel® Core™ i5 (3.4 GHz base frequency, up to 3.9GHz with Intel® Turbo Boost Technology, 6MB L3 cache, 4 cores) Display: 27 inches (68.58 cm) diagonal LED-backlit display with IPS technology; 2560-by-1440 resolution with support for millions of colors Audio features: Stereo speakers Dual microphones Headphone port Headphone/optical digital audio output (minijack) Support for Apple iPhone headset with microphone Integrated Webcam: FaceTime HD camera Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display Support for extended desktop and video mirroring modes Support for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately) Input Apple Wireless Keyboard Full-size keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement) Magic Mouse Smooth, seamless Multi-Touch surface with support for simple gestures (scrolling and swiping). Click and double-click anywhere. Ambidextrous construction accommodates left- and right-handed users. Magic Trackpad Glass Multi-Touch trackpad for precise cursor control; supports inertial scrolling, pinch and expand, swipe, three-finger swipe, four-finger swipe, tap, double-tap, rotate, screen zoom, scroll, click and drag, click drag and lock, secondary click A and B. Ports: SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt ports Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately) 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot Wireless: Wi-Fi 802.11ac Wi-Fi wireless networking;2 IEEE 802.11a/b/g/n compatible Bluetooth Bluetooth 4.0 wireless technology Electrical and Operating Requirements Line voltage: 100-240V AC Frequency: 50Hz to 60Hz, single phase Operating temperature: 50° to 95° F (10° to 35° C) Relative humidity: 5% to 95% noncondensing Operating altitude: tested up to 10,000 feet Product type: Apple iMac (27-inch, Late 2013) All-in-ones Product colour: Natural silver Dimensions (W x D x H): 65.0 cm x 20.3 cm x 51.6 cm Weight: 9.54 kg ( 21 lbs)