Solar energy: equipped with solar panels and rechargeable batteries, which can absorb sunlight and extend the working time. No need to replace the battery. Effective and healthy: Without chemicals, the Mole Repeller vibrates and generates sound waves of 400 to 1000 Hertz in the summer which stimulates the central nervous system of the mouse. It can effectively repel mice, moles, poppies and voles, without using harmful and toxic chemicals that can damage your floor, pets and family. Excellent waterproof properties: The product is waterproof and rainproof and can also work continuously in rainy days. But it cannot be soaked in water for a long time. EXPANDABLE COVERAGE: Works in a circular pattern, about 15m radius and covers up to 700 square meters. To obtain the best possible result, we advise you to install 2 devices every 100 feet for floor areas that come from the maternity ward. Suitable for many locations: in your garden, on your farm or on your travel field, to repel moles,