The “Teen-only” ringtone explanation

Did you know that there are ringtones out there specifically for the younger generation’s ears only? Teenagers may use these ringtones to their advantage. For example, some kids do not want their parents to hear their phone ringing to avoid dragging attention towards their private cellular device. Hence, they use a ringtone that adults are unable to hear. I’ve always wondered how this system worked and the following information is the answer! 

Sounds are vibrations composed of frequencies. “For humans, hearing is limited to frequencies between about 20 Hz and 20,000 Hz (20 kHz), with the upper limit generally decreasing with age.” Basically, as you grow older, you lose your sense of hearing. This allows room for frequencies of sound that are predicted to be “unhearable” by adults. Technology has taken this fact to a further level and now, teenagers enjoy the benefits of special ringtones for their ears only.