HOW TO USE AN ULTRASONIC REPELLER IN HOME - Just plug pest repellent ultrasonic in an electrical outlet and it will start to repel the pests when the red night light is on. The repeller should be placed in a location where its noise will not be affected by walls and furniture. Its Non-Toxic Trap and Repel Spider, Lizard, Mice Repellent Indoor for Insect like Bedbug, Mouse, Mosquito, Ant, Flea, Rats, Cockroaches, Fruit Fly, Rodent, Mouse, Ants Electric Pest Repelling Device. This Rat or Mouse Reject Device is Widely used in villages countryards, house, Lodges, hospitals, hotels, bars, public places, apartments, kindergartens, restaurents, cafes, cinemas, farms, fields, Agri warehouse, Malls and other venues unlike Cockroach Spray.