01-5260442,061-442578,061-442579
21.5-inch (diagonal) Retina 4K display4096-by-2304 resolution with support for one billion colors500 nits brightnessWide color (P3)
3.4GHz quad-core Intel Core i5 (Turbo Boost up to 3.8GHz)
802.11ac Wi-Fi wireless networkingIEEE 802.11a/b/g/n compatible
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: 12.5 pounds (5.66 kg)2