What is that ringtone that only teenagers can hear?

I read about it in a magazine but i forgot what website i have to go to to get it. Any help?What is that ringtone that only teenagers can hear?
mosquito ringtone


you can go to





Ventones.com


its a free ringtones site and totally safe.


i'm sure you wont be spammed





i get mine there..








What is that ringtone that only teenagers can hear?
I think I heard about that. They were called Ultrasonic ringtones. Im sure if you google it you'll find some more info.