SONIC PULSES - The solar-powered outdoor snake repellent emits sonic pulses into the surrounding soil. Snakes will perceive the sound pulses as a source of danger and then move away from your garden and yard. WIDE EFFECTIVE RANGE - Each unit covers 557 square meters. We suggest placing repellents no more than 25 meters apart. In sandy or rocky soil, the distance is reduced to 10 meters. SNAKE REPELLENT - Deters all common snakes such as green snakes, rattlesnakes, copperheads, bull snakes, milk snakes, etc. The solar-powered snake repellents emit sonic sounds into the surrounding soil. WIDE EFFECTIVE RANGE - Each unit covers 566 square meters. We suggest placing repellents no more than 25 meters apart. In sandy or rocky soil, the distance is reduced to 10 meters. SAFE & ECO-FRIENDLY - The snake repellent is safe for dogs, cats, and children and is perfect for environmental awareness.