Ultrasound prevention: Sends every 20-30 seconds a sound wave, this device works thanks to a generator of vibrations by intervals which sends vibrations and ultrasounds 400 Hz - 1,000 Hz. Solar energy saving: Solar panels provide ample power by absorbing light, eliminating the need for extra batteries and charging. It's much cheaper than battery-powered insects. Waterproof and durable: This solar insect repellent is waterproof, so you don't have to worry that it won't work on rainy days. Corrosion resistant and will not contaminate the floor even after long hours of work. Efficient and safe: No pesky chemicals or pesticides, no traps, no dead animals. Will not cause harassment to your cats, dogs and other pets. Environmentally Friendly: The ultrasonic mouse repeller can effectively eliminate hamsters, voles, snakes and other destructive rodents. The device releases vibrations in the ground, these disturb the animals and seek a more pleasant place.