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 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 The Yokiss ultrasonic mosquito repellent keeps away all kinds of insects in 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 he can't walk through walls. Installing one insect repellent in the room or installing more than one type in a larger room will achieve better effects.