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Teacher-proof ringtone hits the US

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A noise designed to drive kids out of shopping malls has been re-engineered as a ringtone which parents and teachers cannot hear.

A Welsh security company markets Mosquito - a loudspeaker which emits an irritating high-pitched sound designed to drive kids away. Because the ability to hear high-pitched sounds declines with age, the noise cannot be heard by older people.

A test in the Register Towers confirmed this - only our youngest cub reporter could hear anything at all. Listen to the sound here.

British kids were quick to sample the sound and turn it into a ringtone to be used in class - they can hear it, but teachers can't.

And now the ringtone has crossed the Atlantic. The Welsh company behind Mosquito credited the kids' ingenuity and is now offering an MP3 ringtone from their website.

Kids in Manhattan have been sharing the tone and using it to receive calls during class without teachers hearing.

More from New York Times here. ®

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