Dual Ultrasonic Technology: Dual Ultrasonic Pest Repeller uses variable frequency technology that emits powerful dual ultrasonic waves. emits ultrasonic frequency 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, 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 outlet 20-80cm from the ground, and the repellent can work 24 hours a day, no additional equipment maintenance is required. Effective for most pests: The ultrasonic repellent 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 , full 360 coverage, but it cannot pass through walls. installing one insect repellent in the room or installing more than one type in a larger room will achieve better effects. Product specifications: Material: ABS The color green Power: 5W Dimensions: 100*65*55mm Bare metal weight: 85 g/piece Quantity delivered: 2 pieces