Ok. I got it. It's the LEGO POWERED UP App where Boost Hub and Funktions are included. It works for Android. For Windows there is an similar App from the fanbase, which I haven't testet yet.
If you use it for sçhool, or a private course I can recomend QUIZLET.
You can connect units from other users, or create your own.
It's a bit like a free Version of PHASE 6
(I only know the free Version of QUIZLET..)
Yes, that's the point. With an adapter the user must perform the low-volt-detection manually.