Retina 4K display
21.5-inch (diagonal) Retina 4K display
4096-by-2304 resolution with support for one billion colors
500 nits brightness
Wide color (P3)
3.6GHz
3.6GHz quad‑core Intel Core i3
Configurable to 3.2GHz 6-core Intel Core i7, Turbo Boost up to 4.6GHz
3.0GHz
3.0GHz 6-core Intel Core i5 (Turbo Boost up to 4.1GHz)
Configurable to 3.2GHz 6-core Intel Core i7, Turbo Boost up to 4.6GHz
3.6GHz
8GB of 2400MHz DDR4 memory
Configurable to 16GB or 32GB
3.0GHz
8GB of 2666MHz DDR4 memory
Configurable to 16GB or 32GB
3.6GHz
256GB SSD
Configurable to 1TB Fusion Drive
3.0GHz
256GB SSD
Configurable to 1TB Fusion Drive
3.6GHz
Radeon Pro 555X with 2GB of GDDR5 memory
3.0GHz
Radeon Pro 560X with 4GB of GDDR5 memory
Configurable to Radeon Pro Vega 20 with 4GB of HBM2 memory
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)
Stereo speakers
Microphone
3.5 mm headphone jack
3.5 mm headphone jack
SDXC card slot
Four USB-A ports
Two Thunderbolt 3 (USB-C) ports with support for:
DisplayPort
Thunderbolt (up to 40Gb/s)
USB 3.1 Gen 2 (up to 10Gb/s)
Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)
10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
Kensington lock slot
Magic Keyboard
Magic Mouse 2
Configurable with Magic Keyboard with Numeric Keypad
Configurable with Magic Trackpad 2
Wi-Fi
802.11ac Wi-Fi wireless networking
IEEE 802.11a/b/g/n compatible
Bluetooth
Bluetooth 4.2 wireless technology
Height: 17.7 inches (45.0 cm)
Width: 20.8 inches (52.8 cm)
Stand depth: 6.9 inches (17.5 cm)
Weight: 12.1 pounds (5.48 kg)2
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 90% noncondensing
Operating altitude: tested up to 16,400 feet (5000 meters)