Screen 21.5-inch Retina display with LED backlight and IPS technology
Screen resolution 4096x2304 pixels
3.0 GHz 6-core Intel Core i5 processor (Turbo Boost up to 4.1 GHz)
RAM
8GB DDR4 2400MHz memory
AMD Radeon Pro 560X 4GB Graphics
FaceTime HD video camera
Supports full native resolution on the built-in display with high color fidelity: millions of colors on the 21.5-inch model and one billion colors on the 21.5-inch model with a 4K display.
1 TB 5400 RPM hard drive
No optical drive
Wi-Fi Connection to Wi-Fi 802.11ac network;
IEEE 802.11a / b / g / n compatible
Bluetooth Bluetooth 4.0
Networking 10/100/1000 BASE ‑ T Gigabit Ethernet
Audio Stereo speakers
Dual microphones
3.5mm headphone jack

     Optical digital audio out / headphone out (mini jack)

     Support for Apple iPhone headset with microphone

Connectivity and Expansion 3.5mm Headphone Jack
SDXC card slot
Four USB 3 ports (USB 2 compatible)
Two Thunderbolt 3 (USB ‑ C) ports supporting a range of features:

     DisplayPort
     Thunderbolt (up to 40 Gbps) 10/100/1000 BASE ‑ T Gigabit Ethernet module (RJ-45 connector)
     USB 3.1 Gen 2 (up to 10 Gbps)
     Thunderbolt 2, HDMI, DVI and VGA support - via optional adapters (sold separately)

10/100/1000 BASE ‑ T Gigabit Ethernet Module (RJ ‑ 45 Connector)
Kensington lock slot
Package Contents 21.5-inch iMac
Magic Keyboard
Magic Mouse 2
Power cable
Lightning to USB cable
MacOS Sierra preinstalled (Photos, iMovie, GarageBand, Pages, Numbers, Keynote, Safari, Mail, Messages, FaceTime, Calendar, Notes, App Store, iTunes, iBooks, Maps, Contacts, Reminders, Mac App Store)
Dimensions and weight 528 x 175 x 450 mm, 5.66 kg
12 months warranty