[Gadget Industry] bills it as “a PC inside a Mouse“, but that depends on your definition of a “PC”. This is a Personal Computer inside a mouse, yes, but there’s nothing IBM-compatible about the tiny ARM board he squeezes inside what’s normally a peripheral — it actually started life as a smartphone, which only takes this build up a notch compared to starting with a single-board computer like a Pi.Specifically, he starts with a Galaxy S21 5G. Starting with a Samsung means he can leave the stock Android alone and just take advantage of Samsung’s DeX desktop mode, rather than layer a Linux environment on top or replace the operating system entirely with something like Postmarket OS, which are both viable options.With the battery compartment removed, the phone guts fit with shocking ease in the once-wireless mouse. Of course that’s not a great thermal environment, but that’s what the brass is for. It acts as a heat spreader, which is about as much thermal management as the phone had from the get-go, so it should work well enough. It seems to in the video, certainly. If thermal throttling is a concern, while it’d be hard to fit in a mouse, there’s no beating liquid cooling.