Ringtone heard only by teens

The Mosquito or Mosquito alarm is a machine 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 areas. As such, it is promoted to reduce anti-social behaviour , such as loitering, vandalism , drug use , drug distribution, and violence. In the UK, over 3, have been sold, mainly for use outside shops and near transport hubs. Critics say that it discriminates against young people and infringes their human rights, while supporters argue that making the Mosquito illegal would infringe the rights of shopkeepers who suffer business losses when "unruly teenagers" drive away their customers.
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The Mosquito

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The Mosquito - Wikipedia

The Origin and Use The technology of mosquito ringtone is sourced from the "mosquito device" developed by Howard Stapleton primarily to drive away the teenagers who hang around the shops in UK. The device that Stapleton developed for Compound Security Systems emitted a sound called "teen buzz" that caused a great deal of annoyance to the teenagers or younger people. However people past the age of teenagers remained largely unaffected by this modulated 17 kHz sound. This same technology was used to develop mosquito ringtone with the only exception that the frequency was kept constant at 17 kHz in this type of ringtone. With advancing age, people start losing gradually the normal hearing ability. This hearing impairment due to age is known as "presbycusis". The range of audibility for a teenager is not what it is for older people.
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The Mosquito

Free Mosquito Ringtones. The Mosquito Ringtone came about after a crafty British man who invented a device called The Mosquito, the Mosquito is a device that emits a very high frequency tone meant to annoy teenagers adults are unable to hear the tone. Some crafty students decided to convert the same technology into a ring tone that only they teenagers could hear! By utilizing this free ringtone, you can get phone calls and receive text messages while in class or school without teachers knowing it.
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T he Teen Buzz ultrasonic ringtones were created by teenagers so that they could be alerted to incoming text messages or calls on their cell phones without nearby adults becoming aware of it. These "secret ringtones" take advantage of the fact that as people age, they lose some of their hearing sensitivity, especially in the higher frequencies. So a high-frequency tone that is at the edge of audibility for most teenagers will be inaudible to many adults over age 20, and to most adults over the age of The tones are not, strictly speaking, ultrasonic, because they can be heard by normal, healthy young people, but they are sometimes called "ultrasonic" ringtones because they are above the frequency range of hearing for most adults. Teen Buzz ultrasonic ringtones may range from 10 to 20 kilohertz kHz ;
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