Free your lawn and garden from moles, voles and other burrowing rodents! Humane and effective! 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. Effectively covers an area up to 10,000 sq. ft. or 1/4 acre. The single aluminum tube has watertight ends. Unobtrusive and doesn't interfere with mowing. 17 17 inches long overall. Requires 4 D-cell batteries (not included) which will operate the unit up to 6 months. Manufacturers lifetime warranty.