The Mosquito is an ultrasonic device that emits a sound only audible to teenagers that is designed to drive teens away from areas they congregate.

…techno-savvy pupils have recorded the ultra-high sound – audible only to under-20s- onto their cell phones, and are now receiving calls and text messages in class – without teachers having the faintest idea of what is going on.

The kids call it Teen Buzz, and it’s spreading it from phone to phone via text messages and Bluetooth.

ringtonia.com: Teenager repellent “Mosquito” turned into ringtone

Sounds too good to be true.