Mosquito Sound

Here's the original version of the mosquito device that's designed to repel teenagers from shops and streets. If you're over 25 you won;t hear anything but the street sounds and a girl laughing. If you're under 25 then you might hear a rather nasty high pitched siren sound. . . Terrible quality (mp3) recording but interesting to know just how much sound isn't heard. Just because you can't hear it doesn't mean it isn't there.