SONIC PULSES- The solar powered snake repeller outdoor sends out sonic pulses into the surrounding soil. The snakes will take the sound pulses as a source of danger and then move away from your garden and yard. WIDE EFFECTIVE RANGE- Each covers 6,000 square feet. We suggest placing repellents no more than 82 feet apart. In sandy or rocky soil reduce to 32 feet. SNAKE AWAY - Repels all common snakes such as green snakes, rattlesnakes, copperheads, bull snakes, milk snakes, and etc. The solar powered snake repellents emit a sonic sounds into the surrounding soil. WIDE EFFECTIVE RANGE- Each covers 6,100 square feet. We suggest placing repellents no more than 82 feet apart. In sandy or rocky soil reduce to 33 feet. SAFE & ENVIRONMENTAL FRIENDLY- The snake away repellent is safe for dogs, cats and kids at all and is perfect for the environmental awareness.