Wide Range of UseEach ultrasonic repeller has an effective range of up to 800-1300ft. It is recommended to install this plunger 32-47 inches off the ground. When installing the device, there should be no obstacles nearby. [Efficacy] The ultrasonic insect repellent stimulates the auditory nerve and central nervous system of pests and rodents with ultrasonic waves in the frequency range. Mouse ultrasound emits high-frequency ultrasound, which is effective against rodents. Easy to Install and UsePlace the ultrasonic mouse repeller 20-100cm from the ground, just plug in our ultrasonic mouse repeller and it will do the rest. You can usually see results within 3-4 weeks, depending the degree of infection. The insect repellent is safe and comfortable The insect repellent is quiet, odorless and radiation-free. It repels pests and rodents with low frequency sound waves that are harmless to humans and pets. Of more, the longer you work, the better the repellent. Safety and environmental protectionNon-toxic, no chemicals, no traps, no killing, the repeller is 100% safe and harmless. A method to physically repel pests, non-toxic, environmentally friendly, absolutely safe for children and pets, combined with state-of-the-art pest control technology