searching at google yesterday night and got some results, so wanna sharing here.
Ultra Sonic Sound is a high frequency sound that could only can hear for children or low ages peoples, what's from the net is said "The ringtone that couldn't been heard by teacher" +_<
Try out this link and test which is the highest frequency you can heard.
The results I get is :
Mine : B (15.8kHz)
My sons Tomy+Edward+Andrew : C# (17.7kHz)
but my wife : A# (14.9kHz) >_<
The older ages could heard the lower frequency, that means my wife older than me
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