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2. 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.

3. Animal repellent - Wikipedia

   en.wikipedia.org/wiki/Animal_repellent

   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 controversial, both because their effectiveness varies from animal to animal and because there have been few scientific studies conducted to prove that they work.

4. Bug zapper - Wikipedia

   en.wikipedia.org/wiki/Bug_zapper

   The design was implemented by two unnamed Denver men and was conceded to be too expensive to be of practical use. The device was 10 by 15 inches (25 by 38 cm), contained 5 incandescent light bulbs, and the grid was 1 ⁄ 16-inch (1.59 mm) wires spaced 1 ⁄ 8-inch (3.17 mm) apart with a voltage of 450 volts. Users were supposed to bait the ...

5. 9 Plants That Keep Squirrels Away From Your Garden - AOL

   www.aol.com/9-plants-keep-squirrels-away...

   Many commercial squirrel repellents rely on cayenne and other hot pepper powders to repel squirrels. Plant your own varieties of hot pepper plants and enjoy a squirrel-free summer and some tasty ...

6. 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]

7. Ultrasonic transducer - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_transducer

   A curvilinear array ultrasonic transducer for use in medical ultrasonography Inside construction of a Philips C5-2 128 element curved array ultrasound sensor. Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad categories: transmitters, receivers and transceivers.