[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.

Quick Share is a useful tool for flipping files between Android smart phones in a fuss-free wireless manner. [unrealJune] has now implemented the feature on Kindle devices.

You’ll need a jailbroken Kindle to use this, which is running the Kindle Unified Application Launcher and KOReader as well. You’ll also want SSH access, and a machine that has Go and Docker for you to build the project. [unrealJune] steps through the steps to compile and install the Quick Share plugin to KOReader, as well as explaining how it works. Notably, it’s receive only—so you can spit files onto the Kindle, but you can’t send them from the Kindle to other devices. The Kindle will also automatically accept files, which is worth noting if you’re security conscious. If there’s no network, the Kindle is also able to appear as its own AP if needed.

Think of this as a nifty convenience if you find yourself regularly trying to truck files on to your jailbroken Kindle. It’s also a neat to see a Quick Share implementation from the open source world. Between-device sharing still sucks, as we’ve discussed before, but there are at least attempts being made to make it better. That’s something!