Rats' audible frequencies start at about 200 Hz at the bottom and go up to about 60 Hz from 20 Khz in the ultrasonic range.
This application generates frequencies specialising in the ultrasonic region and displays the waveform on the screen.
Notes. Depending on the nature of the device speaker, sounds derived from high frequencies may be emitted. Do not listen to high-frequency sounds with your ear directly over the device speaker for long periods of time as this may be harmful to your health.
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