Ultrasonic Bird and Pest RepellerWhy Homeowners Love It: Unlike sprays, poisons, or traps, the Ultrasonic Bird & Pest Defender uses high frequency sound inaudible to humans, but intolerable to unwanted animals. It drives them away without hurting them and without disturbing your gardens natural balance. This device is your silent, invisible shield no traps, no poison, no harm. How It Works (And Why Its So Effective) This device is equipped with a precision 110 PIR motion sensor. When