1.EFFECTIVELY effectively rid lawns, gardens, and planting beds of moles, voles, gophers, armadillos, ground squirrels and other burrowing animals. Penetrates deep into the soil where animals burrow. 2. SOLAR-POWERED - Economic & Safe: It operated by a solar rechargeable battery, just insert the mole stakes in your garden and turn it on, then it will protect your garden from moles, no need replace battery 3. WATERPROOF Waterproof Solar Mole Chaser Spikes: Designed for outdoor use, such as lawns, gardens, and planting beds, stop voles moles digging your yard, give you a non-hole garden 4. EXTENSIVE COVERAGE Extensive Coverage: Operates in a circular pattern . So it is recommended to use 12 solar mole repeller units per acre, insert them every 60 inch