A ring tone meant to fall on deaf ears

Yup... its on the Straits Times today.
Its was a small article though. However, this ringtone (here) has been on international news. New York Times published an article on it on June 12, 2006 (Article).

Handphones are supposed to be switched off in class. However, in these settings where cellphone use is not allowed, these ringtones which the adults supposedly cannot hear is perfect for signalling the arrival of messages. Studies have shown that adults (most) would gradually lose the ability to hear high-pitched sounds

The ringtone that is an the offshoot of an invention called the Mosquito, developed last year by a Welsh security company to annoy teenagers and gratify adults, not the other way around. It is an ear-splitting 17-kilohertz buzzer.

However in face of younger teachers, this method may fall short, only irritating the teacher further. I for one would not try it. I doubt this ringtone would work with our teachers who are only in their 20s.