Ultrasonic technology: Using dual smart chip design, the ultrasonic insect repellent stimulates the auditory nerve with ultrasonic waves in the frequency range of 20kHz to 65kHz, destroying the olfactory and nervous central systems of pests and rodents.This ultrasound can make rats, spiders, flies, fleas, ants, and other types of rodents and insects so uncomfortable, driving them out of our homes and habitats.Eco-friendly and harmless to human body: This repellent repels pests by emitting ultrasonic waves. However, such ultrasound is invisible and harmless to humans and pets. Ultrasonic electronic mosquito repellent can emit non-toxic and radiation-free ultrasonicwaves. Ultrasonic protection is safe, environmentally friendly and low in consumption.Wide coverage: The working area ofthe ultrasonic insect repellent is 80-120 square meters, but the ultrasonic wave does not penetrate the wall. We recommend at least 1 device per room. Ultrasonic repellents are for homes, offices, garages,attics, basements, warehouses and greenhouses.Specifications: European regulationsQuantity shipped: 1 piecePackage Contents: Only the above package contents, excluding other products.Size: 98*57.8*29.7mm(Reminder: The size is measured by hand, please allow 1-2 cm measurement error)Color: white, blue(Due to different monitors and lighting effects, the actual color of the product may be slightly different from the picture color.)