Wenscha Ultrasonic Animal Repeller, Solar Powered Repellent with Motion Sensor Ultrasonic and Red Flashing Lights Outdoor Waterproof Farm Garden Yard Repellent, Cats, Dogs, Foxes, Birds, Skunks, RodEffective: Intense ultrasonic signal to scare the Dogs, Cats, Wild Boars, Mouse, Birds and more other animals away from your zone, house, garden, or yard more. Safe & ECO Friendly: The dog repellent ultrasonic can drive animals away from your garden without using chemicals, the Passive Infrared sensor (PIR) detects motion and triggers and then the ultrasonic speaker emitting a tone that people cannot hear but chases away common outdoor pests.