A battery operated rodent deterrent for indoor use only. The unit emits a sonic signal every 8 seconds, protecting an unobstructed area of up to 2500sq.Ft 232sq. Mts . Requires a single pp3 battery not supplied , which lasts up to 6 months. Environmentally-friendly and safe for humans, pets and other wildlife. We recommend that this product is not used in areas that are occupied by bats.