[Dual Ultrasonic Technology] Using frequency conversion technology, it emits powerful dual ultrasonic waves. Ultrasonic frequencies of 22-65 kHz are emitted to disrupt the central nervous system of pests, driving them out of the house without killing them. [Safety and Environmental Protection] No chemical substances, non-toxic, odorless, silent, no radiation. It is harmless to the health of humans and pets. Simply connect the ultrasonic mosquito repellent to a socket 80-120 cm from the ground, and the mosquito repellent will work 24 hours a day without additional equipment maintenance. [Effective against most pests] The ultrasonic insect repellent keeps all kinds of insects away from your home, such as mice, mosquitoes, spiders, insects, ants, flies, cockroaches, fleas and other pests. No pest carcasses, ideal for use in living rooms, kitchens, bedrooms, warehouses, etc. [Wide Coverage] The effective coverage area of pesticides is 80-100 square meters, with 360 full coverage, but cannot penetrate walls. Installing one repeller in the room or multiple repellents in a larger room will achieve better results.