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Inaudible ringtones

Written by Admin on Wednesday 24 May 2006

An alarm from British firm Compund Security Systems using ultra high sound to drive teenage thugs from shopping centres has been hijacked to create inaudible classroom ringtones, it emerged. School children using mobile phones in class through the creation of ringtones adults cannot hear.

Author -
Publication The Journal (Newcastle)
Date 24 May 2006
Link -

« ‘Teen buzz’ is the new classroom weapon Pupils adapt mosquito alarm into ringtone unaudible for over twenties »