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2. Dog whistle - Wikipedia

   en.wikipedia.org/wiki/Dog_whistle

   Some dog whistles have adjustable sliders for active control of the frequency produced. Trainers may use the whistle simply to get a dog's attention or to inflict pain for the purpose of behaviour modification. In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric ...

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. Animal repellent - Wikipedia

   en.wikipedia.org/wiki/Animal_repellent

   High-frequency whistles are used on vehicles to drive deer away from highways, and similar devices are used to deter certain types of insects or rodents. Repellents of this kind for domestic cats and dogs include ultrasonic devices which emit a high-frequency noise that does not affect humans. These types of non-chemical repellents are ...

5. Ultrasound - Wikipedia

   en.wikipedia.org/wiki/Ultrasound

   Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.

6. Covidien Unveils Sonicision™ Cordless Ultrasonic Dissection ...

   www.aol.com/news/2012-10-01-covidien-unveils...

   Sonicision, the industry's first cordless ultrasonic dissection device, is a hand-held, pistol-grip style, battery-powered surgical ultrasonic device that is indicated for soft-tissue incision and ...

7. Cat repeller - Wikipedia

   en.wikipedia.org/wiki/Cat_repeller

   Moving the device to different locations regularly and combining with another form of cat repellent may make these devices more effective. [2] A statistical survey into customer satisfaction levels with ultrasonic deterrents concluded that 80% of owners expressed satisfaction with the results of ultrasonic deterrent devices. [3]