This case can hold an Arduino Micro Pro (USB-C) with one button and one LED. You can use it for whatever you want but has been designed to be a Mouse Jiggler.

Everything you need to know to make it yours is in this video :

You will find the code right here :

https://github.com/Jbuchs/mouse-jiggler/tree/main

Disclaimer: 
Please make sure to use this device in the most honest way possible, for example to avoid stressing while going to the bathroom ;)
It has not been designed for the purpose of pretending to work.

Use at your own risk.