AMERFIST Mole Repellent Solar Powered – Solar Animal Repeller Stakes for Gopher, Moles, Groundhog – IP44 Waterproof Solar Mole Repellent Stakes for Farm, Garden, Lawn (4 Pack)We recommend an installation of the yard mole repellents on every 96 feet throughout your lawn for optimal performance. Sonic pulses emitted 3 4s sonic pulses for every 30s, it penetrates the soil for and forces pests to evacuate the area covered by the sound Use a 100% kid safe, humane approach to prevent your property from moles voles shrews gophers and destructive ground rodents Moles and gophers and other burrowing rodents are chased away