I’m assuming you mean TruePlay? If so, yes, the data, along with pretty much everything else, is stored on the speakers, and not on the controller, so your son could run TruePlay, and it would remain after his phone goes away. And there would then be a ‘switch’ in your controller, that would allow you to turn on or off the TruePlay function.

Thanks! Absolutely what I meant. Then my problem is solved