Ener-G+ EN656-2 Solar Powered Mole and Gopher Repeller (2 Pack) Includes two units per box Drives away burrowing pests like moles, voles and gophers Functions day and night, sound and vibration emitting every 50 seconds Weatherproof, made of durable ABS plastic and corrosion proof aluminum Covers up to 1500 ft.; zero carbon monoxide emission