I found the sound    http://www.bbc.co.uk/wiltshire/audio/mosquito_sound.mp3  Its like a really loud screech(you can hear youths in the background) im 21 and this noise is horrible, can someone over 25 listen to it, if you can only hear the kids and not the screech then I guess it works, if you can hear the screech then I guess its nonesense.    (I found it on this BBC story)  http://www.bbc.co.uk/wiltshire/conte..._feature.shtml    So one is already in use.