This has to be the coolest application for audio illusion ever! Did you know that ultrasound is only audible by under-20-year-olds? With this application discover the Magical Sounds that you can hear but your parents and big brothers can’t hear, and the other sounds that you can’t hear but your little brother can hear… Another thing, your dog also will have flipped out 😉 Compatible with S^3 / Anna / Belle Smart Phones.