Bonide MoleMax Sonic Stake is a battery-operated mole repellent stake. It mimics the predatory warning sounds of moles, which drives them away from any area you place it. Molemax Sonic Spike Repeller works day and night to protect personal property from destructive rodents, including moles, gophers and ground dwelling squirrels and chipmunks. It simulates the natural distress call that burrowing rodents use to warn others of nearby predators. Our scientifically developed spike is designed for 1 unit to protect up to 7,500 square feet of your yard or garden. For best results, overlapping 2 units is suggested. This spike doesn't contain or use any harmful chemicals in order to repel rodents. Making this an incredibly eco-friendly pest control option. It's safe for use around children and pets also.