How high can you hear?!?
Ultrasonic ringtones that are apparently becoming popular in high school. The students can hear their phone ring but the teacher can't.
Find out the highest pitch you can hear:
http://www.ultrasonic-ringtones.com/
I got 17.7
Last edited by HotHotHeat; 03-22-2009 at 06:41 PM.
Reason: there, their
|