Intelligent working mode: Gopher repellent ultrasonic solar powered Vibration and sound wave pulse of 400 Hz penetrates every 20 seconds. This kind of sound wave impulse will affect the nerve center of animals, making them feel fear, and then leave this place. WATERPROOF: The gopher repellent solar panel is protected in a waterproof ABS plastic housing. So the mole repellent can work even in rainy days.Keep the Solar Panel Clean - Wiping it regularly with a damp cloth.A dirty panel will reduce the amount of sunlight available to charge the units batteries. SAFE FOR KIDS AND PETS: No chemicals or poison is used in this processhumane way to repel moles from tunnelling and causing damage to lawns, vegetable plots and flowers and seedling plant roots.completely safe for humans and pets. Wide coverage: The upgraded mouse repeller has a protection range of up to 1600 feet. It can penetrate the soil and prevent them from entering the protected area, because moles are very sensitive to sound and vibration. This is an effective way to prevent them from damaging your outdoor areas, such as lawns, yards, and gardens. In general, it need about 2-4 weeks to drive the Mole & Gopher away from your garden, Then your garden will be free of these nuisance critters after some weeks