The Mosquito, An Ultrasound Device That Drives Away Teenagers

Via The New York Times:

Now 39, Stapleton has taken the lesson he learned that day--that children can hear sounds at higher frequencies than adults can--to fashion a novel device that he hopes will provide a solution to the eternal problem of obstreperous teenagers who hang around outside stores and cause trouble.

The device, called the Mosquito ("It's small and annoying," Stapleton said), emits a high-frequency pulsing sound that, he said, 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...

At first, members of the usual crowd tried to gather as normal, repeatedly going inside the store with their fingers in their ears and "begging me to turn it off," Gough said. But he held firm and neatly avoided possible aggressive confrontations: "I told them it was to keep birds away because of the bird flu epidemic."

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