For the longest while I used this to tell my friends in high school I had a mini-superpower. Because I knew when there was a television on in the house, and somehow none of them heard it.

There is an old telly in my apartment, I turned it on to test it last week and heard the tone again, must have been like 18+ years since I last turned one of those on.

It never gave me headaches but I definitely heard (and still hear it) all the time.