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