Display

21.5-inch (diagonal) Retina 4K display

4096-by-2304 resolution with support for one billion colors

500 nits brightness

Wide color (P3)

Processor

3.4GHz quad-core Intel Core i5 (Turbo Boost up to 3.8GHz)

Memory

16GB of 2400MHz DDR4 memory

Storage

1TB (5400-rpm) hard drive

Graphics

Radeon Pro 555 with 2GB of VRAM

Video Support and Camera

FaceTime HD camera

Simultaneously supports full native resolution on the built-in display at millions of colors (21.5-inch) or 1 billion colors (21.5-inch 4K) and:

One 5120‑by‑2880 (5K) external display at 60Hz with support for 1 billion colors, or

Two 3840-by-2160 (4K UHD) external displays at 60Hz with support for 1 billion colors, or

Two 4096‑by‑2304 (4K) external displays at 60Hz with support for millions of colors

Thunderbolt 3 digital video output

Native DisplayPort output over USB‑C

Thunderbolt 2, HDMI, DVI, and VGA output supported using adapters (sold separately)

Audio

Stereo speakers

Microphone

3.5 mm headphone jack

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 3 (USB-C) ports with support for:

DisplayPort

Thunderbolt (up to 40 Gbps)

USB 3.1 Gen 2 (up to 10 Gbps)

Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)

10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)

Kensington lock slot

Input

Magic Keyboard

Magic Keyboard comes standard with your iMac. It’s wireless and rechargeable (so you won’t be replacing batteries), with an ultracompact, edge-to-edge design that wastes no surface space. It has a stable scissor mechanism, optimized key travel, and a low profile that provide control and comfort. And it pairs immediately with your iMac right out of the box.

Wireless

Wi-Fi

802.11ac Wi-Fi wireless networking

IEEE 802.11a/b/g/n compatible

Bluetooth

Bluetooth 4.2 wireless technology

Size and Weight

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 (5.66 kg)2

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

In the Box

21.5‑inch iMac with Retina 4K display

Magic Keyboard

Magic Mouse 2

Power cord

Lightning to USB Cable

Operating System

macOS is the operating system that powers everything you do on a Mac. macOS Mojave brings new features inspired by its most powerful users, but designed for everyone. So you can get more out of every click.