[10u152]

Calling it a "microcomputer" is meaningless.

What is it doing? Monitoring some sensors, communicating with a phone via bluetooth, running a screen.

[your_drunk_dad]

It's miniaturized iPhone as it can be used without phone to make calls, receive messages, stream music etc. as it has e-SIM capabilities. It runs Game Boy Color games which is pretty cool even if not very useful.