Archive for April 16th, 2015

April 16, 2015

Mosquito Alarm

buzz off

teen buzz

‘The Mosquito’ or Mosquito alarm is an electronic device used to deter loitering by young people by emitting sound at high frequency that older people have lost the ability to hear. It has two frequency settings, one of approximately 17.4 kHz that can generally be heard only by young people, and another at 8 kHz that can be heard by most people. The maximum potential output sound pressure level is stated by the manufacturer to be 108 decibels. The range of the sound is 140 feet with the sound baffle, and 200 feet without. 

The sound can typically only be heard by people below 25 years of age, as the ability to hear high frequencies deteriorates with age (a phenomenon known as presbycusis). Crafty teenagers turned the sounds into a mobile phone ringtone, which could not be heard by older teachers if the phone rang during a class. Mobile phone speakers are capable of producing frequencies above 20 kHz. This ringtone became informally known as ‘Teen Buzz’ or ‘the Mosquito ringtone’ and has since been sold commercially.

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