In article ,
"Powell" wrote:

CNN had a piece on special ring tones only
teens can hear. Couldn't find link to said. Uses
very high frequencies most adults are unaware
of. Would allow teens to receive calls in the
school class room. I guess only other teens
would find it distracting in doing so.

http://static.orgday.org/orgday/Teen%20Buzz.mp3

I can hear it clearly on the Grados, but not on speakers in the computer
room.

Stephen