With a coverage of 2500 square feet, this ECO friendly Pest-Stop repeller covers a typical house. As well as ultrasonic the repeller uses electromagnetic waves & is highly effective against rodents & most crawling insects. It is eco-friendly & uses less energy by way of a unique Stop-Start cycle. The repeller will not affect domestic pets such as cats dogs birds & fish & also features a pet-safe setting for use around rodent pets (hamsters rabbits pet mice rats & gerbils).