Oh joy! Do you think they'll be available for home use?
Plagued by teenagers? You'll like the sound of this
Telegraph
16/02/2006
As a form of revenge against disruptive youth, it is almost too sweet - a device that annoys teenagers so intensely they have to disperse and loiter somewhere else. Police have given their backing to a gadget that sends out an ultra high-pitched noise that can be heard only by those under 20 and is so distressing it forces them to clutch their ears in discomfort. Eventually they can stand it no longer and have to move on.
But because the body's natural ability to detect some frequency wave bands diminishes almost entirely after 20, adults are completely immune to the sounds.
And if a siren doesn't work, try this
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