Just as “DIY Car Radio replacement” this can be an alternative for people who do not like radio's but want to listen from music of their phone. I took the Car radio out en put this extra storage pace in :-). There is an usb charger build in. Below that a connector to an external amplifier. With the buttons I can switch them on or off.
But of course you can use the switches for anything you like :-)
PS: oh and I also included a Cup for the little Cup holder. A smaller and bigger one. Both also one the picture. The bigger one fits precisely in an “Renault Twingo”.