PEST OFFense™ uses the wiring to within your wall to create what we like to call a "force field" around your home. PEST OFFense™ sends a pulse through the wiring that creates an environment that irritates the central nervous system of pest, taking away their ability to nest, breed and find food. This environment irritates them to the point that they leave the walls where they nest and breed. PEST OFFense™ is specifically designed for mice, rats & roaches. Though the units are only guaranteed for these pest, we do continually receive testimonials from customers on many other pests such as ants, crickets, silverfish, scorpions, etc... PEST OFFense™ is SAFE for humans of all ages and most common household pets. If you have a rodent based pet such as a hamster, guinea pig or gerbil, we do not recommend using PEST OFFense™. The units come with a 1 Year Manufacturer Warrantee and a 30 Day Money Back Guarantee. All this for just $29.95.