The NUC
On the front, you get two USB 3.0 ports, a headphone jack, IR receiver, and an SD card reader. On the back, you have power, optical audio, Gigabit Ethernet, 2x USB 3.0 ports, the mini DisplayPort, Thunderbolt 3.0, and HDMI 2.0.
There are vents on either side.
This is where you take apart the unit to install the remaining components.
This is what it looks like on your desk.