The original ultrasonic ringtone high frequency hearing test Find out just how far your ears can hear into the range of ultrasonic ringtones. they can only be heard by kids and generally can't be heard by adults over the age over 20 or so.
Several young students have caught on to a recent trend: a ring tone that only they can hear and most adults can't. Dubbed the Mosquito, the.
Students are using a new ring tone to receive messages in class -- and many teachers can't even hear the ring.