【PIR Infrared Sensor】Our ultrasonic cat repellent is equipped with a PIR sensor An infrared sensor that continuously emits signals. When it detects that a moving animal is within the detection range, it will automatically emit a sound wave frequency to drive the animal away. 【Solar Powered & IP44 Waterproof Design】This ultrasonic cat repellent can work in all weather, its waterproof rating 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 Charging】A solar panel is placed above the mouse repeller 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 environmentally friendly. Can work effectively all year round in almost all weather conditions. 【Easy Installation】The ultrasonic animal repellent comes with a pole that can be connected directly to the ground. Portable and small size design,