Comparison to regular Xbox One controller (we're still rocking our Day One Edition)

Not as many buttons/functions to be sure, but this is wayyyy more configurable.

A total of nineteen "3.5 mm connection ports" line the backside of this controller. These allow for a virtually limitless number of ways to play.

Some of these are digital, some are analog, and some are both! Microsoft was nice enough to lay it all out for users in these two guides.

"Switches... allow people with limited mobility to control a game using different parts of their body, like their head, foot, or mouth. But switches, typically made by medical supply companies, can be expensive—up to $200 apiece—and clunky." -wired

Hello from Seattle! Model 1836. Also, three threaded mounting points so you can secure this thing however you need.