The Bell + Howell Ultrasonic Indoor Pest Repeller offers a safe, chemical-free way to keep pests like mice, rats, roaches, spiders, and ants away. Using inaudible ultrasonic waves, it gently drives pests out without disturbing humans or pets. Silent, odorless, and easy to use, each device covers one room—this 4-pack helps protect multiple areas in your home or office efficiently. Say goodbye to traps and poisons and enjoy a pest-free space with this reliable and eco-friendly solution.