Mosquito Ringtones , i.e.ringtones that can't be heard by those over 30, such as parents and teachers.
Will could hear 16khz (age range 30 & younger). The highest range I could hear definitively was 12khz (50 & younger), and even that I could only hear once. The second time it just made my ears vibrate.
How old are your ears?
edit: broken link - I'
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Poor Kelsey, those things hurt her ears terribly...it's so freaky to see the evidence right in front of your face when your kids act like dogs around a dog whistle and can hear it and you can't. It's just a really weird feeling.
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