I just did a "teenager audio test" and I was actually able to hear the sound (though it almost curled my toe nails because it's so unbearable):
It's amusing how the website reads:
[This is] a tone that is generally only heard by people under the age of 25. It has been used as a deterrent device to keep teenagers from loitering in malls and shops, and sounds similar to a buzzing mosquito.
(emphasis mine). That reminded me of my first---and probably only---visit to an Abercrombie and Fitch store in a Florida mall that I left as fast as I went in, driven out by the ridiculously obnoxious "store smell" they were spraying there (though there seem to be people who like it). Seriously, if I wanted to smell cheap cologne, I'd talk to some poor, drunk souls at the friendly neighborhood dive. But in general, I appreciate stores that don't need to drug me to make me buy their products...
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