The Vanish Solar Mole Repeller repels unwanted burrowing rodents with the strongest and least expensive power available, the sun. Solar-powered and maintenance-free, this mole repeller uses state-of-the-art technology to repel moles, gophers, voles, shrews and other destructive burrowing rodents. It produces a sonic pulse of approximately 400 Hz every 30 seconds and covers an area of approximately 7000 square feet. Best of all, it is environmentally friendly and eliminates the use of poisons and traps around your children and pets. Since one full charge yields up to 5 days of trouble-free power, the unit is capable of operating even in unfavorable weather without interruption.