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  2. Sonic weapon - Wikipedia

    en.wikipedia.org/wiki/Sonic_weapon

    The device works by emitting an ultra-high frequency blast (around 19–20 kHz) that teenagers or people under approximately 20 are susceptible to and find uncomfortable. Age-related hearing loss apparently prevents the ultra-high pitch sound from causing a nuisance to those in their late twenties and above, though this is wholly dependent on a ...

  3. Electronic pest control - Wikipedia

    en.wikipedia.org/wiki/Electronic_pest_control

    Electronic pest control is the name given to any of several types of electrically powered devices designed to repel or eliminate pests, usually rodents or insects. Since these devices are not regulated under the Federal Insecticide, Fungicide, and Rodenticide Act in the United States, the EPA does not require the same kind of efficacy testing that it does for chemical pesticides.

  4. Ultrasonic antifouling - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_antifouling

    Ultrasonic antifouling. Ultrasonic antifouling is a technology that uses high frequency sound ( ultrasound) to prevent or reduce biofouling on underwater structures, surfaces, and medium. Ultrasound is just high frequency sound (which humans can not hear). Ultrasound has the same physical properties as human-audible sound.

  5. Have a dog that won’t stop barking? An expert tells ... - AOL

    www.aol.com/dog-won-t-stop-barking-195838107.html

    Burch said purchasing an anti-barking device could also be a possible solution. “(These devices) send out a powerful tone that is high-pitched,” she said. “Dogs learn that if they are quiet ...

  6. Acoustic levitation - Wikipedia

    en.wikipedia.org/wiki/Acoustic_levitation

    Acoustic levitation is a method for suspending matter in air against gravity using acoustic radiation pressure from high intensity sound waves. [ 1][ 2] It works on the same principles as acoustic tweezers by harnessing acoustic radiation forces. However acoustic tweezers are generally small scale devices which operate in a fluid medium and are ...

  7. Cat repeller - Wikipedia

    en.wikipedia.org/wiki/Cat_repeller

    Cat repeller. A cat repeller is a device or substance used to discourage cats from entering an area, or to encourage them to leave if they do enter. Such deterrents are most commonly used by gardeners, in order to prevent damage to their gardens, to avoid cat feces, or to protect birds .

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