A noise that annoys.

• Position: Teens' behavior in convenience stores - Brief Article

Rowdy teens used to hang out in front of the Spar convenience store in Barry, Wares. According to the store's owner, Robert Gough [rhymes with "tough"), they intimidated other customers and "they'd be in the shop fighting, stealing, and assaulting the staff." So Howard Stapleton, a security consultant, offered to let Gough try his invention: the Mosquito. This small electronic box emits a pulsating squeak at a frequency usually inaudible to anyone over 30. At first, the kids begged Gough to turn off the noise; then they left. "It's loud and squeaky and it just goes...