'Mosquito’ device shuts up Britain’s anti-social teenagers / Cafe Babel, 12 June 2008
http://www.cafebabel.com/eng/article/24999/mosquito-device-shuts-britains-anti-social-teenage.html
Betttina Schwarzmayr
"If you are over 25, you can’t hear it. The noise was first used to scare away vermin. Since January 2006, the 16, 000 Hertz frequency of the ‘Mosquito’ device specifically targets Britain’s young people. With 5, 000 sold and some 3, 500 high frequency-emitting electronic gadgets in use in most of the UK’s shops, the phenomenon is now emerging in Belgium, France, Germany and Switzerland."