Looks and works like new, hasn't seen a lot of use so selling on.

Comes with original box + mouse and keyboard.

Happy to answer any questions

Specifications:

27-inch (diagonal) Retina 5K display with IPS technology 8GB (two 4GB) of 1867MHz DDR3 memory; four SO-DIMM slots, user accessible Configurable to 16GB or 32GB 1TB Fusion Drive AMD Radeon R9 M390 graphics processor with 2GB of GDDR5 memory Simultaneously supports full native resolution on the built-in display and up to two 4096-by-2160 external displays or one 5120-by-2880 dual-cable external display Support for extended desktop and video mirroring modes

Magic Keyboard The redesigned Magic Keyboard comes standard with your iMac. It’s wireless and rechargeable (so you won’t be replacing batteries), with an ultracompact, edge-to-edge design that wastes no surface space. It has an improved scissor mechanism, optimized key travel, and a lower profile that increase control and comfort. And it pairs immediately with your iMac right out of the box.

Magic Mouse 2 The new design of Magic Mouse 2 lets it glide more smoothly across your desk. And since it supports Multi-Touch, you can use simple gestures on its surface to do things such as swipe between web pages and scroll through documents. So if you prefer to use a wireless mouse but want some of the benefits of Multi-Touch, Magic Mouse 2 is a great choice.