Dual Ultrasonic Technology Yokiss Dual Ultrasonic Pest Repeller uses variable frequency technology that emits powerful dual ultrasonic waves. emits an ultrasonic frequency of 22-65khz to disrupt the central nervous system of pests which will drive them out of your home without killing them. Safe and environmentally friendly No chemicals. nontoxic. odorless. quiet and radiation-free. It is harmless to the health of humans and pets. Simply connect the ultrasonic mosquito repellent to the outlet 80-120cm from the ground, and the repellent can work 24 hours a day. No additional equipment maintenance is required. Effective for most pests The Yokiss ultrasonic repeller keeps all kinds of insects away from your home. such as mice. mosquitoes. spiders. the insects. the ants. the flies. cockroaches. fleas and other pests. etc no pest corpse. perfect for use in the living room. the kitchen. bedroom. the warehouse. etc Wide coverage area The effective coverage area of the insecticide is 80-100 square meters. full 360 coverage. but he can't walk through walls. installing one insect repellent in the room or installing several types in a larger room will achieve better effects. 24 month warranty Best results will be seen after continuous use for 2-3 weeks. If you have any problems using it. please feel free to contact seller at any time. we will provide you with the highest level of customer service.