Ultrasonic Repeller: This is our advanced version. It uses ultrasonic theory and changes the frequency to stimulate the auditory system of mosquitoes and other pests, making them unbearable and uncomfortable. Wide Coverage: Each electronic ultrasonic repeller is effective in a large area of up to 80-120 m². However, the ultrasound does not penetrate walls. We recommend using at least one device per room. The ultrasonic repeller is ideal for homes, offices, garages, attics, basements, warehouses, and greenhouses. Easy to use: Simply plug the ultrasonic mosquito repellent into an electrical outlet. Make sure to install it vertically at a height of 30 to 120 cm from the ground. Eco-friendly and safe: Ultrasonic sound only acts on pests and rodents and is completely harmless to humans and pets. No radiation, no chemicals, no odor, no noise. Quality assurance: Ultrasonic pest control usually takes 3 to 4 weeks to achieve variable results, depending on the extent of the infestation.