Product selection: 2pcs, 4pcs 1.[Working method]: The solar probe deflector vibrates and sends 400-1000 Hz low-frequency sound impulses in all directions every 30 seconds, which do not physically damage these pests. They just feel uncomfortable and drive them away. No death, no poison, no traps. Solar Mole Repellent is an environmentally friendly way, ideal for garden, farm, greenhouse. 2.[SOLAR OPERATION & WATERPROOF]: With a solar panel on the top of the device, solar energy can save energy and protect the environment. It can also be charged using the USB cable. This outdoor repellent is made of high-quality ABS plastic with a weatherproof and UV-protected construction that protects against splashing water from all directions and withstands rain, snow or the harsh sun, perfect for the garden, yard, farm ... 3.[Environmentally friendly materials]: Made of high quality ABS and aluminum tubes, IP65 waterproof and corrosion-resistant and does not strain the floor even after long work. The green outer shell can be easily hidden in plants and can also be used as a garden ornament 4.[Wide effective work area]: device works in a circular pattern, about 15 m in radius and covers up to 700 square meters. To achieve the best possible result, we recommend installing 2 devices every 100 feet for floor surfaces that are used by moles. 5.[Easy to Install]: Widely use and Wide infrared sensor range: Simply take it out of the box, select your desired mode, then insert the repeller in the ground, mounted against the wall or put the top part directly on the flat surface.