It is pest repeller adopted ultrasonic technology which is humane, eco-friendly, pollution-free and high efficient Powered by solar panel, no messy power cord, low energy consumption and environmental friendliness With PIR motion sensor, the system will emit ultrasonic frequency when detecting movements within a certain range. The frequency adjustable ultrasonic can repel different animals, such as birds, dogs, foxes, mice, squirrels, etc. Weatherproof, designed for outdoor use, effectively protect your crops or your garden of destruction