The 21.5-inch iMac is available with the all-new Retina 4K display featuring an amazing 4096 x 2304 resolution and 9.4 million pixels, 4.5 times more than the standard 21.5-inch iMac display.
The new Retina displays feature a wider color gamut that brings more brilliant and true-to-life colors to your desktop. With standard sRGB-based displays, many of the colors you see in real life never make it to your screen. The new Retina 5K and 4K displays feature a wider P3-based color gamut that provides a 25 percent larger color space, and with more available colors, images are more vivid, reveal even greater detail and appear more lifelike than ever.
The all-new Magic Keyboard, Magic Mouse 2 and Magic Trackpad 2 are more comfortable, capable and environmentally friendly. Designed around a built-in rechargeable lithium-ion battery, all three accessories eliminate the need for disposable batteries and feature a noticeably more solid internal structure and quality feel. The new Magic Keyboard features a full-size keyboard in a sleek new design that takes up 13 percent less space on your desktop. With a new scissor mechanism and lower profile, the Magic Keyboard provides an incredibly stable, precise and comfortable typing experience. The new Magic Mouse 2 is lighter, sturdier and features an optimized foot design for a smoother glide. The new Magic Trackpad 2 features a 29 percent larger surface and brings Force Touch to the desktop for the first time. Force Touch enables a range of new ways to interact with your Mac®, including the new Force click to quickly look up a word, preview a file or bring up a map from an address. The new Magic devices pair instantly with your Mac as soon as they are plugged in via the Lightning®-to-USB charging cable, and can last about a month or more on a full charge.