A new mobile revolution!! You've never heard anything like it!! And you might actually never manage to!
If your over 30, chances are your ears are too old to experience the Mosquitone.
The mosquitone is a high frequency sound that 25 year-olds or less will experience and those older will not. Only you and your friends will hear it while teachers, parents and older siblings wont!
Use it in class, public places where mobiles are not allowed or any other place when you don´t want anyone else to know your using your mobile. Try it out and drive them crazy!!!!
¿What's the sound like? Check it out!
(Lookout: Reproducing all 4 mosquitones at the same time might produce interferance)