Display

• 21.5-inch (diagonal) Retina 4K display with IPS technology
• 4096-by-2304 resolution with support for millions of colors

Processor

3.3GHz quad-core Intel Core i7 (Turbo Boost up to 3.8GHz)

RAM

16GB of 1867MHz LPDDR3 onboard memory

Hard Drive

512GB SSD storage

Graphics Coprocessor

Intel Iris Pro Graphics 6200

Wireless Type

• 802.11ac Wi-Fi wireless networking, IEEE 802.11a/b/g/n compatible

•Bluetooth 4.0 wireless technology

Connections

• 3.5 mm headphone jack
• SDXC card slot
• Four USB 3 ports (compatible with USB 2)
• Two Thunderbolt 2 ports
  • Mini DisplayPort output
  • Support for HDMI, DVI, VGA, and dual-link DVI (adapters sold separately)
• 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
• Kensington lock slot

Display Support

Connect up to: 

•Three dual-cable 5K displays

•Six Thunderbolt displays

Audio Support

• Stereo speakers
• Dual microphones
• 3.5 mm headphone jack
  • Headphone/optical digital audio output (minijack)
  • Support for Apple iPhone headset with microphone

Video Support

• FaceTime HD camera
• Simultaneously supports full native resolution on the built-in display and up to 4096 by 2304 pixels on an external display
• Support for extended desktop and video mirroring modes