... mole repeller device powered by solar energy, making use of sound waves to repel harmful rodents(moles,voles,etc ... . To make the best use of the product, we strongly recommend an installation of 2 devices at every 30 ... bar into the earth, be careful not to use excessive force lest the device be damaged, or ... the safe line (note illustration).2. Before first use,you’d better insolation the solar panel for ...