This state of the art device is the most advanced and powerful deterrent available against underground intruders. It works to deter moles, gophers, voles, shrews, pocket mice, ground squirrels and many other destructive burrowing rodents. The Molechaser's unique design utilizes a patented DC motor drive which generates powerful vibrations that, though harmless to humans and pets, are devastating to underground-dwelling rodents. Simply bury the Vibrasonic Molechaser flush in the ground and it will go to work to repel destructive underground critters within about a 13,500 sq. ft. area. That's up to 1/3 of an acre! Within 7-14 days of continuous use, the intruders will have moved out to a new home. Limited Lifetime Warranty!