A Mosquito that scatters swarms of unruly teens: Got a teenager you can’t persuade to move out of the house?
The device, called the Mosquito (“It’s small and annoying,” Stapleton said), emits a high-frequency pulsing sound that, he says, can be heard by most people younger than 20 and almost no one older than 30. The sound is designed to so irritate young people that after several minutes, they cannot stand it and go away.
So far, the Mosquito has been road-tested in only one place, at the entrance to the Spar convenience store in this town in south Wales. […] The results were almost instantaneous. Where disaffected youths used to congregate, now there is no one.