The Victor PestChaser 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 PestChaser 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. The easy to use design makes this the ideal method for anyone regardless of previous experience repelling rats and mice. Simply plug the PestChaser into a 110V wall outlet, and let the repellent do the work for you. But if you cannot hear it, how will you know it is working. The PestChaser comes equipped with a nightlight that glows softly to provide illumination, but also lets you know it is working. The PestChaser is a long lasting repellent that can keep your home infestation free for up to 3 to 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. Utilize these repellents in areas where your rodent and rabbit pets are not allowed to roam.