Wednesday, February 23, 2011

Ear-Piercing Sirens Used to Drive Teens Away

The so-called "Mosquito" device emits high-frequency noise which is audible — and annoying — to young ears, but generally not heard by people over 20.

Ear-Piercing Sirens Used to Drive Teens Away
Ear-Piercing Sirens Used to Drive Teens Away
Ear-Piercing Sirens Used to Drive Teens Away

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