PIR Infrared Sensor Our ultrasonic device for cats is equipped with a PIR sensor, which is an infrared sensor that continuously emits signals. When it detects a moving animal within the detection range, it automatically emits a sonic frequency to guide the animal. Solar Design and Waterproof IP44 This ultrasonic cat repeller can work in all weather conditions and is waterproof to IPX44. Its waterproof design enables it to work in various weather conditions such as rain, snow, ice, wind, etc. (Do not soak in water). A solar panel is placed on the top of the solar charging mouse repeller, which can be charged using sunlight. Efficient charging, long standby time all day, no need to replace batteries, energy saving and environmental protection. Works effectively all year round in almost all weather conditions. Easy to Install The ultrasonic animal repeller comes with a pole that can be directly connected to the ground. Portable and small size design, it can be installed in your home, garden, yard or anywhere else. It can help you protect your property and garden from naughty stray dogs, stray cats and other small animals. Environmentally friendly and versatile, this outdoor cat repellent does not contain any chemicals or pesticides, and is safe for both humans and pets. Great for repelling cats, dogs, rodents and other unwelcome animals. Ultrasonic cat repellent is perfect for gardens, yards, lawns, farms, kindergartens, etc.