The Victor Pest Chaser Rodent Repellent might be small, but it is mighty in its capabilities. Each plug-in repellent provides coverage to medium-sized rooms such as kitchens, living rooms, bedrooms, and more. The Pest Chaser is so effective due to the high-frequency sound it emits. While the noise sounds like a jackhammer to rodents and encourages them to leave the area, humans and most pets are incapable of hearing it at all. Simply plug the Pest Chaser into a 110V wall outlet and let the repellent do the work for you! The Pest Chaser is a long-lasting repellent that can keep your home infestation free for up to 3-5 years. While there is no risk of poisoning with this repellent, pet rodents and rabbits will not appreciate this device being placed in rooms where they live as they are sensitive to the sound.