1. Equipped with PIR sensor, light sensor and load speaker, ultrasonic transmission, strong induction ability, thus they are powerful animal tufter and hygienism / quiet guardian. 2. Solar-powered, energy-saving and durable. 3. Insert them into the earth in your garden or housing estate to drive animals(such as dogs, cats, rats) away, and keep your place quiet and clean. 4. The effective repellent distance is 6-8m. 5. Got the FCC / CE / ROHS certification.