I bought 3 new units from the recomended link.
They all talk to each other just fine.
the bar across the screen goes from left to right nonstop.
the middle button does nothing
the brightness goes from dim to bright with the bar
had the same symptoms as the version 1.0 the units came with, updated from the app.
I watched a video that said the middle button changed screens and if I held the middle button the bar would come up and change the brightness. I can’t see any other screens and the brightness keeps changing.