jasonbourne52 You can hear a pin drop. Wow! That is proof to you, I presume, that you have perfect hearing. Go get a test. You will be surprised at the middle frequencies you do not hear, much less the ones above about 200 cps that a dropped pin makes; however, we can just turn the volume up a whole lot and hear stuff that is normally silent to us. even if with a highly different frequency curve than a baby, or young teen. I bet if you ask a bunch of tweens if they use a ringtone out of teh frequency of adults, you will find some a=who can demonstrate this to you. This ring allows them to check messages in class, without allowing the teacher to hear it.