Tech savvy pupils across the UK’s secondary schools are using a high-pitched ringtone which cannot be heard by adults to get away with using mobile phones in classrooms.
The Mosquito alarm, which is commonly used to drive youths away from shopping centres, can only be heard by people less than 20 years of age. Pupils have turned the alarm into a ringtone and it has quickly spread via Bluetooth and text message.
As we get older we all suffer from presbycusis, age related hearing loss, and this affects our ability to hear the highest frequencies of 18 – 20kHz, the exact frequency of the Mosquito alarm.
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