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The so-called “noiseless ringtones” are actually sound of 17000 Hertz. Setting it up as ringtones, students can easily hear the sound of coming messages, though; teachers are not in the least consciousness.

What the “noiseless ringtones” use is the most basic acoustics principle. The frequency that can be caught by human beings is at the slice between 20 to 20000 Hertz. As age goes up, a human’s hearing would suffer a decline, with a symptom that feeling less sensitive to high frequency sound. Professional research demonstrates that most people lose the ability of identifying sound above 17000 Hertz after 35 years old.

The prototype of the “noiseless ringtone”, named “mosquito”, is a kind of acoustics technique invented by a Wales security company. It is used to drive away adolescents who idle around shopping malls. Being reached by the repeatedly broadcasted “mosquito” just for a couple of minutes, adolescents would build up an intense agitated mood, while elders are hardly affected.

Through repeated trial, a high-school student invented the ringtone from ?mosquito?. And now “mosquito” and other high frequency ringtones of the same principle can be found everywhere on the internet and young people may spend 2.99 dollars to download ringtones to their mobile phones easily.

Given the risk of this kind of mobile ringtones, for there are also very young teachers, some students think it is needlessly to use the “noiseless ringtones”, but the vibrating mode is enough to avoid being caught by teachers.

As to whether it would influence one’s hearing, professors from St. Louis University Medical College said “noiseless ringtones” wouldn’t cause advanced hearing decline as long as the volume was not over high.

Actually, this cell phone ringtone hasn’t been flooded in schools. A director assistant said so far there hadn?t been any complaint due to the ringtones.

However, it has been a recalcitrant problem worried by parents that children spend too much time on their mobile phones, and what if in the class teachers are not in the least consciousness?