This is apparently the so called "Mosquito sound"
the Mosquito sound is supposed to be only heard by teenagers and never by people over the age of thirty. It's designed to irritate teenagers and deter then from loitering around shops etc.
However.. I'm not sure if it's just me, or my particularly acute hearing but I can hear it and it annoys the pants off me.. and I'm over 30 !
Just wondering if you can hear it and what age group you're in
anyway apparently it's been converted into a ring tone for use "out and about"
here's the sound
EDIT
Also I should add.. how effective would this be at keeping teenagers away from your property? I'm dubious to it's effectiveness as it would drive ME mad
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