Special SALE For Holidays and Black Friday This listing has the best model available.MHK33LL/AOriginal Box is Included For All Units( Although it is distress due to handling and shipping)Original Keyboard Included For All Units .Original Magic Mouse Included For All units.Manual Included For All units.Original Power Cord Included For All units.Some units have polishing cloth.
Display

• 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)

Processor

• 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

Memory

• 3.0GHz
  8GB of 2666MHz DDR4 memory
  Configurable to 16GB or 32GB

Storage1

• 3.0GHz
  256GB SSD
  Configurable to 1TB Fusion Drive

Graphics

• 3.0GHz
  Radeon Pro 560X with 4GB of GDDR5 memory
  Configurable to Radeon Pro Vega 20 with 4GB of HBM2 memory

Video Support and Camera

• 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 supportfor 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)
  Audio
  • Stereo speakers
  • Microphone
  • 3.5 mm headphone jack
  Connections and Expansion
  • 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
  Input
  • Magic Keyboard
  • Magic Mouse 2
  • Configurable with Magic Keyboard with Numeric Keypad
  • Configurable with Magic Trackpad 2
  Wireless
  • Wi-Fi
    802.11ac Wi-Fi wireless networking
    IEEE 802.11a/b/g/n compatible
  • Bluetooth
    Bluetooth 4.2 wireless technology
  Size and Weight
  • 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
  Electrical and Operating Requirements
  • 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)
  In the Box
  • iMac with Retina 4K display
  • Magic Keyboard
  • Magic Mouse 2
  • Power cord
  • Lightning to USB Cable
  • Polishing cloth ( Some units)