Ultrasonic Technology: The insect repellent has the function of changing the auditory system of mosquitoes by emitting ultrasonic sound. In this environment, these mosquitoes will feel anxious and worried, and then quickly run away. It can effectively keep mice, mice, spiders, fleas, cockroaches, ants, flies and mosquitoes away from your home. Safety and environmental protection: The insect repellent contains no chemicals, no radiation, no odor, no dead insects, no batteries and provides you with a safety guarantee. Its ultrasound only affects parasites, and the ears cannot detect sounds, so it will not interfere or irritate humans and animals Application range: The maximum coverage area of the ultrasonic mosquito repellent is 80-120 square meters. Since ultrasound cannot pass through walls, it is recommended to use one device per room for best results. Wide Range of Work: Very suitable for bedrooms, shopping malls, offices, garages, attics, basements and warehouses. Easy to use: Simply plug the anti-rodent ultrasonic box into the socket, without adjustment. Using ultrasound to get rid of parasites is a process that will probably take about 3-4 weeks to clearly show the effect. The ultrasound device is effective, environmentally friendly and completely risk . Ultrasonic + electromagnetic, frequency conversion double wave technology, physical methods to fight pests, especially effective, non-toxic, environmentally friendly, and safe for children and pets. Environmental friendly non-toxic 1. No chemicals and sprays, wont hurt your pets. 2. No noise, wont annoy you. 3. No radiation, safety. 4. Easy to use, just plug it into the outlet. Parameter: Ultrasonic Frequency: 22~65KHZ Input Voltage: AC90V~250V Effective coverage area: About 80-120 square meters. Note: 1) The ultrasonic mouse and rat should be installed 80~120cm from the floor, and should be vertical to the floor and connected to the socket (better effect). 2 ) One unit for each room is recommended for the best result, because the solid like wall, furniture and so on, will weaken the effect of the ultrasonic wave. Package: 4 x Ultrasonic Pest Repeller 1 x User Manual