Mosquito is a teenager repellent - an ultrasonic device that emits a sound only audible to teenagers. It's targeted to business seeking a solution to anti social youths hanging in front of their stores fronts and driving their customers away.
The box is installed in front of a store and emits an unbearable sound, only discernable to those under 20! driving them away.
Apparently, the company has sold thousands of models in the UK, to the complete delight of it's inventor, Howard Stapleton.
In their own words:
It seems that there is a very real medical phenomenon known as presbycusis or age related hearing loss which, according to The Merck Manual of Diagnosis and Therapy, "begins after the age of 20 but is usually significant only in persons over 65". It first affects the highest frequencies (18 to 20 kHz) notably in those who have turned 20 years of age". It is possible to generate a high frequency sound that is audible only to teenagers.
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