Solar Powered Ultrasonic Repeller vibrates and sends out 400HZ low frequency pulses every 30 seconds to repel mice. The solar panel is charged to accumulate energy to run when it is dark. 8 hours solar charge can work continuously for 7 days without battery replacement. The Solar Powered Ultrasonic Repeller 's solar panel is protected in a waterproof ABS plastic housing. Therefore, even in rainy days, the Solar Powered Ultrasonic Repeller can work continuously. The solar rodent Repeller is constructed with waterproof, anti-corrosion, ABS plastic unit, which is very durable and long-lasting, perfect for outdoor rodent repelling in yards, lawns, gardens, etc. Humane and safe, the vibration and sound waves are harmless to humans, pets and the environment. The vibrations and sonic pulses will penetrate the soil and radiate in all directions, forcing the pests to leave and find other places to live. There are no chemicals, poisons or any dangerous ingredients. Insert the solar powered rodent Repellers into the ground and press the button and they will start working immediately. It is recommended to use multiple devices overlapping, with two products 45ft apart to create better coverage. It usually takes 2-4 weeks for moles, gophers, voles and other burrowing rodents to leave the area.