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.
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