PIR Infrared SensorOur cat ultrasonic device is equipped with a PIR sensor. An infrared sensor that emits signals continuously. When it detects that a moving animal is within the detection range, it will automatically transmits a frequency sound wave to lead the animal. Solar Powered & IP44 Waterproof DesignThis ultrasonic cat repellent can work in any weather, its waterproof reaches IPX44. Its waterproof design allows it to work in all weather conditions such as rain, snow, ice and wind (do not soak in water). Solar ChargingA solar panel is placed above the mouse repellent which can be charged by solar energy in the sun. Efficiently charged to maintain long standby time all day, no need to replace battery, save energy and environmentally friendly. Can operate effectively year-round in almost any weather condition. Easy InstallationThe ultrasonic animal repeller comes with a pole that can be connected directly to the ground. Portable and small size design, it can be installed in your home, garden, yard or anywhere else. He can help you to stay away from naughty stray dogs, stray cats and other small animals, thus protecting your property and garden. Eco-Friendly and VersatileThe powerful outdoor cat repellents contain no chemicals or pesticides, safe for humans and pets. Ideal for hunting cats, dogs, rodents and all other animals unwanted. Ultrasonic animal repeller ideal for garden, yard, lawn, farm, kindergarten, etc.