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Electronic insect repellent is a new high-tech electronic product. It uses frequency sweep high-frequency ultrasonic circuit to produce 20~55KHZ sweep ultrasonic wave. Scientific research finds insect pests such as mosquitoes, cockroaches, mice, mites and other pests in the range of sound waves in this frequency, and their internal secretion system and physiological function will produce flocculation. It has the effect of expelling and killing. Ultrasound is harmless to human beings and other animals, because people who are over 20KHZ can not hear it.
