Ultrasonic pest repellers are electronic devices that discharge high-frequency noises developed to push back, hurt or eliminate household bugs, such as rodents and pests. Whether they're in fact efficient at doing so has actually been contested by testing laboratories and the United States Federal Trade Commission (FTC).
Left uncontrolled, rodents and bugs can transfer salmonella, hantavirus and other illness, in addition to cause significant structure damage. Indications of a rodent infestation include droppings, specifically near food and below sinks, chomped or chewed food packages, and holes in structural materials that can supply entry into the house.
How They Work
Using audible sound to prevent insects is an old method; the ancient Chinese used a number of mechanically operated sensory-repellent devices to prevent rodent invasions in farming crops and buildings. Ultrasound, which is specified by sound frequencies beyond the ceiling of human hearing, has actually been used as pest control just over the past couple of years, however.
The ultrasonic devices are plugged into a house's electrical receptacle outlets which then purportedly emit high-frequency sounds that are disruptive to pests. The sound allegedly triggers a physiological reaction called audiogenic seizure response, which is characterized by non-directional running, convulsions, and possibly death from cerebral hemorrhage. The theory behind the gadgets is that confused rodents eventually run away when the disturbance prevents them from gathering food, reproducing, building nests or communicating. Ultrasonic gadgets are popular and enticing to consumers because of their ease of use and that they are silent to human ears and presumably eliminate the requirement for traps and poison, which are believed by some to be inhumane forms of bug control. Electro-magnetic and subsonic gadgets are also available, and all styles differ by signal intensity, rate and frequency.
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