Working Principle - The built-in PIR motion sensor can detect small movements within a 110-degree arc and can reach a distance of 30 feet. Once the animal enters the protection zone, the PIR sensor starts working, then it emits ultrasound and a red light turns on, thus repelling the animal. Solar Powered & Waterproof - The top of the Animal Detector uses solar panels that can convert sunlight into electrical energy, which is good for energy saving and environmental protection. The high-quality ABS plastic structure is IP44 waterproof and can also be used outdoors on rainy days. Human Body Design - Solar animal repellents simply drive animals away without any chemicals. It only emits 400Hz-1000Hz ultrasound to drive them away. Will not cause any harm to the human body. Will not harm your own cat, dog, or other pet Easy to install - Our animal repellents are easy to install and offer many mounting options. Whether mounted on a wall or fence or simply plugged into the ground, this