Sonic spike pulses every 30 seconds, penetrating the soil. The pulses are highly irritating to moles and gophers causing them to leave the area. Ideal to get rid of moles, voles, gophers, and burrowing rodents. Use near plants, trees, and vegetables. Operates in a circular pattern, approximately 95' in diameter. Requires (3) D batteries, not included. Features a convenient removable battery sleeve for easy battery replacement. Battery life is approximately 4 to 6 months. Will not harm pets. Mow over design allows spike to operate flush with the ground. Waterproof.