3.4GHz quad-core Intel 7th Gen Kaby Lake i5 with Turbo Boost up to 3.8GHz
8gb RAM
1TB Fusion Drive
Radeon Pro 570 with 4GB video memory
Retina 5K 5120 x 2880 P3 Display

3.4GHz quad-core Intel 7th Gen Kaby Lake i5 processor (Turbo Boost up to 3.8GHz)
32GB of 2400MHz DDR4 Memory; four user-accessible SO-DIMM slots Customize and Upgrade to 64GB
27-inch (diagonal) Retina 5K display with IPS technology; 5120-by-2880 resolution with support for millions of colors
1TB Fusion Drive (Configure up to 1TB Flash Drive)
Radeon Pro 570 with 4GB video memory
FaceTime HD camera
Simultaneously supports full native resolution on the built-in display and up to two 3840 4096 x 2160 external displays or one 5120 x 2880 dual-cable external display
Support for extended desktop and video mirroring modes
802.11ac Wi-Fi Wireless networking; IEEE 802.11a/b/g/n compatible
Bluetooth 4.2 wireless technology
Stereo speakers
Dual microphones
Headphone/optical digital audio output (minijack)
Support for Apple iPhone headset with microphone
Mac OS
Height: 20.3 inches (51.6 cm), Width: 25.6 inches (65.0 cm), Stand Depth: 8 inches (20.3 cm)
Weight: 21 pounds (9.54 kg)
Your iMac comes with 90 days of free telephone support and a one-year limited warranty. Purchase the AppleCare Protection Plan to extend your service and support to three years from your computer?s purchase date. Only the AppleCare Protection Plan provides you with direct telephone support from Apple technical experts and the assurance that repairs will be handled by Apple-authorized technicians using genuine Apple parts. For more information, visit Apple support or call 1-800-823-2775.
ENERGY STAR Version 6.1 requirements
Rated EPEAT Gold

Connections and Expansion

SDXC card slot
Four USB 3 ports (compatible with USB 2)
Two Thunderbolt 3 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

What is in the box:

Apple Magic Keyboard
Apple Magic Mouse 2
Power cord
Lightning to USB cable