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THE makers of a controversial device designed to break up groups of teenager trouble-makers have developed a new version capable of annoying everyone.
The original Mosquito device, launched in 2005, disperses young people by emitting an irritating high-pitched pulse which, at 17 kilohertz, most people aged under 20 can hear but almost nobody over 30 can.
But following demand for a device that would get rid of all undesirables regardless of age, the new Mark 4 version can operate at a lower eight kilohertz frequency that adults can hear too, annoying everyone within earshot.
"It's something we've been asked for by a lot of law enforcement agencies in Britain and abroad," Compound Security Systems commercial director Simon Morris said.