About this item Ultrasonic Prevention: Sends out a sound wave every 20-30 seconds, this device works by an interval vibration generator that sends out 400Hz - 1,000Hz vibrations and ultrasound. Solar Energy Saving: Solar panels provide enough energy by absorbing light, eliminating the need for extra batteries and charging. It is much cheaper than battery-powered insect repellents. Waterproof and Durable: This solar insect repellent is waterproof, so you don't have to worry about it not working on rainy days. Corrosion resistant and will not contaminate the soil even after long hours of work. Effective and Safe: No annoying chemicals or pesticides, no traps, no dead animals. Will not cause harassment to your cats, dogs and other pets. Environmentally friendly: The ultrasonic mouse repellent can effectively eliminate hamsters, voles, snakes and other destructive rodents. The device releases vibrations into the ground, which disturb the animals and seek a more pleasant place.