I was using ultrasonic on phone 40% volume with my phone being 2 feet away from me for 40 mins and now I’ve got a headache…
4 hour masked usage had given me headache once and headache has never happened before.
How did you guys find a setting that worked for you?
I’m worried that if volume is too low, it’ll be useless…
So just it and trial until I find a sweet spot with no headache or something better?