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Such devices like the "Mosquito" or "Sound Teaser" have been used for expel loitering teenagers at public places for years. The emitted high frequency sounds can not be longer perceived by most elderly. This is due to hearing

Bats are oriented by echolocation. In this way they send periodically a high-pitched tone and orient themselves according to the reflected sound waves, like a radar.With this free app for Android you can simulate a tone in