Environmentally friendly indoor electronic pest repeller Deters mice, rats, and roaches from nesting within the walls Emits electronic signals through the wiring within the walls to create a protective force field Covers one level of an average-size home (approximately 1,800 square feet). Ideal for dorm rooms, apartments, or homes Do not use PEST OFFENSE if you have a pet mouse, rat, hamster, gerbil, guinea pig, tarantula, or chinchilla