Made of high quality ABS plastic for long term use. The waterproof design was made to meet the needs of rainy days. Chemical-free - The repeller vibrates and produces sound waves of 400 to 1000 Hertz through the buzzer, which stimulates the central nervous system of the mouse. It can effectively repel mice, moles, gophers and voles without using harmful and toxic chemicals that can harm your soil, pets and family. Equipped with solar panels and rechargeable batteries able to absorb sunlight and provide longer working time, battery does not need to be replaced and no need to be recharged. Polycrystalline silicon solar modules feature high power conversion rate, environmental protection, energy saving and plug-and-play properties. Solar panels can provide enough power to operate the repeller. The solar repeller emits ultrasonic sound every 40 seconds which works in all directions within 650 square meters.