A. High - tech solar panels are built - in, which can directly use solar energy for charging without additional batteries, saving a large amount of energy. It is practical and environmentally friendly. It takes about 5 hours to fully charge in the sun. B. High - efficiency and safety: The solar mole repeller vibrates and generates approximate sound waves. This ultrasonic solar repeller is effective against pests such as cockroaches, rats, mice, and snakes. By vibrating and emitting sound waves between 400 and 1000 hertz, it stimulates the central nervous system of mice. It is relatively efficient in eliminating moles and rats and can repel destructive rodents such as moles, snakes, and other rodents. C. Harmless to humans and pets: The mole repeller emits a 2 - second pulse every 30 seconds, generating vibration and sound waves to drive away moles and deter animals such as rats, moles, voles, and gophers. It does not use soil - damaging chemicals. This mole repeller is harmless to humans and pets. It can also repel voles. D. Wide range of action: This solar mole repeller is powerful and effective. The device works in a circular pattern, with an action range of about 15 meters and a coverage area of up to 650 square meters. It is recommended to install 2 to 4 devices every 100 meters in your garden or yard for better results.