@Shenman question is, does it say it is BT 4.2 or something or you concluded it’s BT because of frequencies used?
I’m pointing out that, bc with phonak, they use their modified BT, for tv connector for example. So it goes through the same frequency range but protocol is implemented differently. Resulting in several times lower energy consumption than regular BT. Phonak calls it airstream for their tv connector, whilst for roger mic they didn’t gave a name, but still use same frequency range.
But since it uses different encoding protocol than standard BT, standard BT devices just won’t work.
My guess is that they discard many checks that standard BT implements. Plus, they definitely implement some recognition for their devices, since we can’t swap accessories between manufacturers families.
Btw, wifi 2.4 is also in the same range as BT is.
And rau didn’t say anything wrong, he said it’s proprietary wireless protocol, which I’m inclined to believe, given how manufacturers often work in this field.
Not every wireless is called wifi, like some are called BT, some airstream and there’s probably a ton of them more.
In short, unless your aid specification explicitly say which BT protocol it uses, it’s not BT.
It looks like a duck, but if it doesn’t quack like a duck, it’s not a duck.