Mosquito Ringtone
Have you ever wondered how dogs can hear a whistle that makes no sound? Now most adults will wonder how teenagers are hearing their cell phone when there is no sound! The tone is 17KHz and as our ears lose the ability to hear high frequencies as we get older it means this ringtone can not be heard by the over 20s. Initially the Mosquito ringtone was meant as a deterrent to loitering teenagers, but now the tables have turned and the teenagers are using it to hear their cell phones while in class – which are supposed to be off.
Aug 15, 11:17 by