I came across this set of ringtones made specifically for kids to use in class or other settings when a ringing phone would bring unwanted attention. The ringtones employ high frequencies that adults can't hear, because of "Acute hearing loss that comes with age". I took their hearing test, listening to increasing frequencies until I couldn't hear the sound any more. I wish I hadn't, since I'm apparently hearing at a 40-year-old level!!!
Maybe I'll test it on Cooper to see what he can hear. ...then the neighbor's dog just for fun!
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