SOLAR PEST REPELLER Simply pay a stake in the land at a location of your choice, and leave it to charge in the sun. The passive Infared sensor (PIR) detects motion and triggers the ultrasonic speaker emitting a tone to chases away common outdoor pests like dogs, cats, foxes, deer, raccoons, mice, skunks, squirrels and more. This solar repeller is a safe and human way to keep unwanted animals away!