Very high pitch disturbing sound for 12 hours

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About this video:

A study also shows that sounds in the higher frequency range of around 2,000 to 5,000 Hz were rated as the most unpleasant. "This is the frequency range where our ears are most sensitive. And this video contains 3500 Hz sound for a 12-hour long period. 3500hz is the average of 2000 and 5000.

Perfect for annoying people
wake up friends
for fun

And this sound can't be easily traced. so you can easily hide the sound source or the speaker.

Caution!
Don't play this sound in front of patients.

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