Fanta believe teens should have the right to play. The brief was to produce a mobile phone application for teens so they can play without their fun being spoilt by adults. This idea was inspired by the controversial ultra-sonic alarms used to disperse teenage groups - these play high-pitch sounds which only young people can hear. When you get older you can't hear these sounds any more as your hearing naturally deteriorates. We turned the technology on its head. The mobile application we invented, The Fanta Stealth Sound System, enables the same teenagers to communicate between themselves using frequencies 'that adults can't hear.'