This Ultrasonic Pest Repeller uses ultrasonic frequency sound waves to make pests and rodents such as mice, mosquitoes, flies, roaches, insects, ants, spiders uncomfortable and afflictive, force them leave your home. Outdoor pests and rodents will no longer try entering your home, these are inaudible and safe to humans and pets, 100% safe and effective. Just simply plug the Pest Repeller into a power outlet, then it will repel the pests. The ultrasonic frequency is inaudible to humans and pets, 100% Safe, it is the safest pest control solution.