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How does this work?

How does this device work?

https://carplaymmb.com/products/mmb-bmw-...rrency=USD

My mate had this and it's basically an android box which connects to carplay (wirelessly). Does anybody know how that's possible OR if there is a way to create an app that does the same thing for an android phone?

it connects to the screen wiring and is acts as a standlone device that supports carplay and transmits to the screen