Display

•21.5-inch (diagonal) Retina 4K display with IPS technology

•4096-by-2304 resolution with support for millions of colors

Processor

3.0GHz quad‑core Intel Core i5 (Turbo Boost up to 3.5GHz)

RAM

16GB of 1867MHz LPDDR3 onboard memory

Hard Drive

512GB SSD storage

Graphics Coprocessor

Radeon Pro 555 with 2GB of VRAM

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 3 (USB-C) ports with support for:
  • DisplayPort
  • Thunderbolt (up to 40 Gbps)
  • USB 3.1 Gen 2 (up to 10 Gbps)
  • Thunderbolt 2, HDMI, DVI, and VGA supported using 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
• Microphone
• 3.5 mm headphone jack
  • Support for Apple iPhone headset with microphone

Video Support

• 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)