iMac (21.5-inch, Late 2015/16)

Display

• 21.5-inch (diagonal) LED-backlit display with IPS technology; 1920-by-1080 resolution with support for millions of colors

Processor

• 2.7GHz
  2.7GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.2GHz) with 4MB L3 cache

Memory

• 8GB (two 4GB) of 1600MHz DDR3 memory
  
  

Storage

• 1TB (5400-rpm) hard drive
  
  

Graphics

• 2.7GHz
  Intel Iris Pro graphics

Video Support and Camera

• FaceTime HD camera
• Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display
• Support for extended desktop and video mirroring modes
• Support for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately)

Audio

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

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