Can I hear ultrasonic ringtones? Find out just how far your ears can hear into the range of ultrasonic ringtones. Pretty much everyone should be able to hear the.
NEW YORK - Students are using a new ring tone to receive messages in class -- and many teachers can't even hear the ring. Some students.
The tones are not, strictly speaking, ultrasonic, because they can be heard by normal, healthy young people, but they are sometimes called "ultrasonic" ringtones.
Inventor Howard Stapleton, creator of the Mosquito teen repellent, says only a few people over age 30 can hear the Mosquito's sound. He and.
In what could be the most frustratingly ingenious application of teenage subterfuge to date, the Beep app was built to let youth communicate.