What’s the buzz? Teens can’t stand it describes a new technology for dispersing loitering kids:
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.
The grocery store we went to just used classical music.