Frequencies Pro is a Audio & Multimedia::iPod software developed by Corey Stewart. After our trial and test, the software was found to be official, secure and free. Here is the official description for Frequencies Pro: Like to annoy children, teenagers, or classmates without the teacher or adults hearing? There's an app for that! 'Frequencies' makes extremely high in pitch noises (12 to choose from) that cannot be heard by adults, depending on their hearing ability. But when you can hear it, it is very annoying.
Frequencies Pro has a feature that alternates between two frequencies, so it is both annoying and noticeable, and will make the children's heads turn and look for what is making that strange noise! Fun to do in class! Also, plug it into some speakers in a public place, run Frequencies Pro, and let the fun begin! you can download Frequencies Pro free now.