Have a look at it, you really want it. And you too can build it. A YouTuber Vincent Buso has uploaded this short video demo of the Keymu. What you see is actually, what you get. Definitely, it is the clamshell design of the Game Boy Advance SP that has shrunk down to an ultra-portable keychain size. This Keymu has four buttons instead of two that runs ROMs using an Intel Edison chip. The Keymu is a little bit more polished and the extra buttons on it mean you could play Sega Genesis and some Super Nintendo games too.
The developer was reportedly inspired by a project from the 2016 Hackaday superconference that has used the form of the original Game Boy.
In the Hackaday superconference spirit, the developer is also uploading detailed instructions for those who want to take a crack at building their own Keymu. So far, they have just posted an intro, an image gallery, and only one blog post. However, more is promised.
I could be wrong to some extent, but if some enterprising individual wants to figure out how to manufacture these for a decent price, they would have a surprising item on their hands.
Though the item is surprising and would take a particular share in the wallets of game lovers to take the device everywhere with them so they can enjoy the games and refresh their minds, the too much small size is also becoming a point of criticism here. People say it is somewhat irritating to have a tiny item that is suitable for the kids’ tiny hands.