This board, technically called a macro pad, is the creation of YouTuber, modder, and keyboard enthusiast, TaeKeyboards, who reviews and customizes mechanical keyboards on his own (very popular) channel.
This particular macro pad was actually modded from a Drop X OLKB Preonic mechanical keyboard and outfitted with a bunch of custom elements, including...
Though, if making one of these is something you’d endeavor to do, just make sure your programming and hardware skills are squared away.
In the process of modding this little treat, TaeKeyboards eventually encountered some trouble when he realized the Preonic keyboard wasn’t initially by VIA programming software and even once added, was only programmable up to 16 keys.