Display

• 21.5-inch (diagonal) Retina 4K display with IPS technology
• 4096-by-2304 resolution with support for millions of colors

Processor

• 3.1GHz quad-core Intel Core i5 (Turbo Boost up to 3.6GHz)
  Configurable to 3.3GHz quad-core Intel Core i7 (Turbo Boost up to 3.8GHz)

Memory

• 8GB of 1867MHz LPDDR3 onboard memory
  Configurable to 16GB

Storage¹

• 1TB (5400-rpm) hard drive
  Configurable up to 2TB Fusion Drive or 512GB of flash storage (SSD)

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 by 2304 pixels on an external display
• Support for extended desktop and video mirroring modes

Audio

• Stereo speakers
• Dual microphones
• 3.5 mm headphone jack
  • Headphone/optical digital audio output (minijack)
  • Support for Apple iPhone headset with microphone

Connections and Expansion

• 3.5 mm 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

Input

• Magic Keyboard
  The redesigned Magic Keyboard comes standard with your iMac. It’s wireless and rechargeable, with an ultracompact, edge-to-edge design that wastes no surface space. It has an improved scissor mechanism, optimized key travel, and a lower profile that increase control and comfort. And it pairs immediately with your iMac right out of the box.
• Magic Mouse 2
  The new design of Magic Mouse 2 lets it glide more smoothly across your desk. And since it supports Multi-Touch, you can use simple gestures on its surface to do things such as swipe between web pages and scroll through documents. So if you prefer to use a wireless mouse but want some of the benefits of Multi-Touch, Magic Mouse 2 is a great choice.
• Magic Trackpad 2
  If you prefer using a trackpad, Magic Trackpad 2 gives you the full range of Multi-Touch gestures and introduces Force Touch to the desktop. Sensors underneath the trackpad surface detect subtle differences in the amount of pressure you apply, bringing more functionality to your fingertips and enabling a deeper connection to your content. This new design, along with a lower profile, makes it even more comfortable to use.

Wireless

• Wi-Fi
  802.11ac Wi-Fi wireless networking
  IEEE 802.11a/b/g/n compatible
• Bluetooth
  Bluetooth 4.0 wireless technology

Size and Weight

• 21.5-inch iMac
  Height: 17.7 inches (45.0 cm)
  Width: 20.8 inches (52.8 cm)
  Stand depth: 6.9 inches (17.5 cm)
  Weight: 12.5 pounds (5.68 kg)²
• 21.5-inch iMac with built-in VESA adapter
  Height: 15.7 inches (37.9 cm)
  Width: 20.8 inches (52.8 cm)
  Depth (including built-in VESA adapter): 2.6 inches (6.6 cm)

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.