High-Pitched Device Drives Away Teens - CBS News - Annoying high pitch sound teens
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The Mosquito or Mosquito alarm is a machine used to deter loitering by young people by emitting sound at high frequency, .. Now crime gadget can annoy us all, BBC News; ^ Jump up to: The Epoch Times. 6 August Joan Delaney. It blares a constant, high-pitched ringing noise all night long — but one It's intended to prevent loitering and vandalism by teens and young.