The body is the best doctor. When I put my head near my WiFi router, I get a headache. That tells me there's something harmful coming from there
I tried Bluetooth. Same. Within 10 minutes, headache so I stuck with my wired headphones. I have literally not seen one person on the street use wired headphones for years. The ignorance/apathy is astounding. The dangers are not even being hidden any more. 1 simple Google search is all it takes.
What's even worse is you see players pre match using Bluetooth all the time ( very prominent in EPL ) and nobody at the club tells them not to. That can't be good preparation and will almost certainly mean lower performance. Glad our players don't seem to do that.