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F.A.Q. Frequently asked questions.

Mosquito Tone Audibility Test

Background

Frequency-wise, our hearing ability ranges from 20Hz up to 20.000Hz (please refer to our high-frequency extension audio test to give your hearing ability a test). As we get older, the 20k upper limit decreases: this phenomenon is medically known as presbycusis. Therefore, it is possible to generate high frequencies that are audible only to teenagers. Since these high pitched sounds are uncomfortable to withstand, they can be used - for example - to repel loitering teenagers in the street.

The test files

A -3dbFS steady sine tone at 17.4kHz and its modulated version, oscillating between 17kHz and 20kHz, 3 times per second.

If you hear any of these two mosquito sounds, you will then be repelled by security products like the Mosquito. Lucky you! This indeed means you either are young or your ears are still in very good condition!

External Links

• Prebyscusis
• Mosquito @ Wikipedia
• Compound Security's Mosquito Product Page
• Debate, Pro and Cons