This application containing the best collection of high frequency sounds for android devices. Sounds have been selected very carefully to be a good and fun user experience, we hope you will enjoy using the app and listening to high frequency sounds. High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).