ALEKO SMR01 Solar Mole Repellent Outdoor Waterproof Mouse Rat Snake Repellent Pest Control Repels by emitting sound waves of 400 Hz every 50 seconds in all directions that drive away moles, mice, rats, and other rodents Easy and safe to use. No poison, no harmful chemicals. Durable waterproof plastic and aluminum construction Economical. Powered by solar panel, no need for batteries or electricity 15.5 inch tube can be installed into the ground deeper and more firmly Covers range of approximately 2625 square feet