The Mosquito or Mosquito alarm is an electronic device used to deter loitering by young people by emitting sound at high frequency, in some versions so it can be heard mostly by younger people. The devices have attracted controversy on the basis of human rights and discrimination concerns.
The device is marketed as a safety and security tool for preventing youths from congregating in specific. Mosquito ringtones emit high- frequency tones that are inaudible by adults but can be heard by teenagers. It is very normal for people to lose their hearing as they age.
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The loss of hearing is gradual in most people, while other may experience more severe hearing loss. The de Havilland DH. 98 Mosquito is a British twin- engine shoulder- winged multi- role combat aircraft, introduced during the Second World War, unusual in that its frame was constructed almost entirely of was nicknamed The Wooden Wonder, or " Mossie" to its crews.