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I have a Moonlander split keyboard that is programmable and uses one of these little things for its reset button. My only gripe with it is that they could have designed a place for it to slot into the keyboard itself since it's very easy to lose it if it isn't otherwise attached to something.
Why do you have to reset your keyboard, future boy?
The reset button is used to apply firmware changes. For this keyboard you can customize the keys to pretty much however you like. I have one of the thumb cluster buttons set to Ctrl-C / Ctrl-V for efficiency. It's great for making changes to personalize your mechanical keyboard experience... but it requires that pin to make changes lol.
I like it since I can assign Enter to one of the left thumb cluster buttons, you normally can't hit enter with your left hand on a standard keyboard layout.