Dual Ultrasonic Technology Dual Ultrasonic Pest Repeller uses variable frequency technology that emits powerful dual ultrasonic waves. emits an ultrasonic frequency of 22-65 kHz to disrupt the central nervous system of pests which will drive them out of your home without killing them. Safe and eco-friendly No chemicals, non-toxic, odorless, quiet and radiation-free. It is harmless to the health of humans and pets. Simply connect the ultrasonic mosquito repellent to the socket 80-120cm from the ground and the repellent can work 24 hours a day, no additional equipment maintenance is required. Effective for most pests ultrasonic repeller keeps all kinds of insects away from your home, such as mice, mosquitoes, spiders, insects, ants, flies, cockroaches, fleas and other pests, etc. . no pest corpse, perfect for use in living room, kitchen, bedroom, warehouse etc. Wide coverage area The effective coverage area of the insecticide is 80-100 square meters, 360 full coverage, but it cannot