P3 Sonic Molechaser Plus 3 Original Sonic Molechasers to Keep Yards Mole Free Drive out damaging moles, gophers, shrews, woodchucks, and burrowing rodents from yard or garden. Combine one P7900 Sonic Molechaser and three P7901 Original Molechasers for an economical, effective way to save lawn or garden! Determine area of worst infestation. Insert 4D cell batteries not included into pull out battery tubes. Dig spaced holes at edge of infestation or area to protect. Mow Over Design if completely inserted into ground. Insert. Pack soil tightly around each unit. Irritating ground vibrations start immediately occur every 15 seconds. Rodents flee. Dogs, cats and other ground animals are not effected. Dry, sandy, or peat soil does not conduct sound waves as far as harder packed soils like clay. Note Picture shows green metal molechaser this is a silver one. P7900 Sonic Molechaser R , made from an aluminum billet, operates in a circular pattern, about 120 unobstructed feet in diameter, protecting about 1/4 acre. Remove Sonic Molechaser R if ground freezes or when flooding occurs. Install the P7901 units made from weather proof black, high impact ABS. Both types have green plastic water proof caps. Each about 15 inches long. P7901 vibrations are felt up to 1/5 acre. Battery life is 4 to 6 months. Limited Lifetime Manufacturer's Warranty. NOTE Do not expect instant results. Use continuously for 7 to 14 days before effective gopher control or mole control is seen. Initially, the Mole Chaser can cause increased pest activity. Gopher pests and moles can mistake currents as a food source gophers and moles leave when they realize the currents are not food. Approved by consumer groups tested by a U.S. certified laboratory.