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PIR Infrared SensorOur cat ultrasonic device is equipped with a PIR sensor An infrared sensor that emits signals continuously. When it detects a moving animal is within the detection range, it will automatically emit a sound wave frequency to lead the animal. Solar design and Waterproof IP44 This ultrasonic cat repellent can work in all weathers, 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 a long standby time all day, no need to replace the battery, energy saving and environmental friendly. Can work effectively all year round in almost all weather conditions. 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. It can help you stay away from naughty stray dogs, stray cats and other small animals, protecting your property and garden. Eco-Friendly and VersatileThe powerful outdoor cat repellent contains no chemicals or pesticides, safe for humans and pets. Ideal for hunting cats, dogs, rodents and other unwanted animals. Ultrasonic animal repeller ideal for garden, yard, lawn, farm, kindergarten, etc.