While other bat repellents are not pet friendly, have no real effect, and smell bad, they work silently on human ears, have no odor, completely eliminate bats, and are 100% safe for children and pets. How it Works - This ultrasonic bat repellent works on a biological level by sending out ultrasonic waves to send bats and other unwanted guests back to nature. That means no dead bats, rats, mice, flies or bugs to keep you clean of your house, and a unit covers 100-800 square feet. Enjoy life in a pest-free home - While this ultrasonic repellent is designed to eliminate bats, it also works on mice, rats, flies, bugs, mosquitoes, fleas and cockroaches. We are real people who use our own products every day. We want the best for our family and we want the best for yours.