It's not bluetooth as far as I know.
Microsoft has released a bluetooh headset for xbox as well, but the old one I bought is without, but still on the 2.4GHz freq.
My flat has concrete walls and I have tried bluetooth headsets here, but the xbox headset seems to work better for some reason.
I check what you said regarding on and off and that works. My only problem is that my home automation server is supposed to run without a monitor, so I have to connect via teamviewer every time and that's not an optimal situation.
Thank you for the feedback, I will check out what you described regarding checking the mic status and see if that could help.