Agrepel Electronic Rodent and Pest Repeller protects your home, farm, feed, and livestock, detering rodents by using ultrasonic waves. Each repeller covers approximately 2,000 square feet. It is recommended to use one repeller per level of a house or building. It creates a barrier to pests by working through wiring in a home or building to create a powerful force field. Protection provided 24/7 for 365 days per year. No maintenance required on device. Mice and rats are driven out by ultrasonic waves which create an uncomfortable environment for them. Ideal for indoor and outdoor environments known for infestations.