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Re: Alarm to send street yobs fleeing
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Originally Posted by punky
This has to be a wind up. An alarm that only under 20s can hear? How the hell does that work? What happens when you turn 20? You suddenly get a new set of ears or something?
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Originally Posted by bbc
It works by sending out an ear-piercing noise which is only clearly audible to people aged under 20.
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Presumably high frequency. Older people aren't that good at hearing high frequencies. But it's unlikely it would suddenly stop being audible when you reach 20.
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