Frees your lawn and garden of moles, voles and other burrowing rodents. Humane and effective. With no obtrusive control head, this sonic chaser, when inserted underground, blasts a penetrating sonic pulse at 25-second intervals. Inaudible to humans and pets, it sends rodents scurrying away from the vibrations. Covers an area up to 7,500 sq.ft. The 17 in. single aluminum tube has 100% watertight ends. Requires 2 D-cell batteries (not furnished) which operate the unit for up to 6 months. Lasts for years.