IMPORTANT!!! Make sure place it under the sunlight for powering the Solar. It works for MOST of Animals, but some Naughty or Brave ones are exceptions (e.g. some cats, dogs) And if the device keeps flashing or beeping, it's the alert for lacking of power, you may need place it under the direct sunlight (try not place it on the corner, because it has limited sunlight). Effective: Intense ultrasonic signal to scare the Wild Boars, Mouse, Birds and more other animals away from your house, garden or yard Safe: No chemical components threatens human's health, the Passive Infrared sensor (PIR) detects motion and triggers and then the ultrasonic speaker emitting a tone that chases away common outdoor pests. Energy-Saving: Powered by solar energy, cordless and rechargeable, high efficiency and low power consumption. Weatherproof: All year-round and virtually all weather conditions still 100% working. Easy installation: It can be mounted in ground with the provided spike, or hang on wall