On this application you can test different ultrasonic audiblent depending on your age. Indeed UltraSound produces several sounds from 8000 to 20 000Hz! So is what your ears hear just as well? Test yourself with your friends more or less old to understand the differences in age ... 6 ultrasound to try different ...For persons under:-100 years-60 years-50 years-30 years-25 years-22 yearsand more available in the full versionAn external speaker is needed on the first generation iPod Touch for use UltraSound.Beware the use of ultrasound can interfere with some people.
||Compatible with iPhone, iPod Touch, and iPad. Requires iOS 3.1 or later. iTunes account required