Ring Tones You Can’t Hear
Well . . you can’t hear them if you’re older. These are ring tones that can be heard by younger people – technically, those that still can hear sounds at the high end of the audio frequency range — but not by those that are middle-aged or older.
The ring tone originally was developed by a security company to annoy teenagers (disperse a group) and not bother adults. It is described as “an ear-splitting 17-kilohertz buzzer.” The idea was hi-jacked and is now an off-shoot is available at no charge over the Internet. The original company now has its own ring tone available — the Mosquitotone.