الموضوع: جهاز طارد الفئران

أي كلام

Effects on rodents[edit]
Rodents adjust to the ultrasound (or any new sound) and eventually ignore it. However, At best, ultrasonic waves have only a partial or temporary effect on rodents. Numerous studies[which?] have rejected ultrasonic sound as a practical means of rodent control.[citation needed] Tests of commercial ultrasonic devices[which?] have indicated that rodents may be repelled from the immediate area of the ultrasound device for a few minutes to a few days, but they will nearly always return and resume normal activities. Other tests[which?] have shown that the degree of repellance depends on the frequency, intensity, and pre-existing condition of the rodent infestation. The intensity of such sounds must be so great that damage to humans or domestic animals would also be likely; commercial ultrasonic pest control devices do not produce sounds of such intensity.[8]