Ultrasonic Protection: Dog repellers only emit ultrasonic waves from 13.5 kHz to 45.5 kHz, which is harmless to the human body. At the same time, it does not contain chemicals and dangerous products. It will keep animals away without hurting them. Humanized design will not hurt your cats, dogs or other pets. Infrared Sensor: The nose of the owl repellent is an infrared (PIR) sensor, which can detect animals of all sizes. The effective area covers an arc of 120 degrees and a distance of up to 10 m. Once pets enter within 10 meters, the motion sensor emits ultrasonic waves and LED lighting makes the pet feel uncomfortable and scares away. Ultrasound + Loud Flashing LED + Sound AlarmThere are 14 powerful LED lights in the eyes of the device. As for its mouth, it's an ultrasonic transmitter. When the external repellent detects movement and body heat, it emits a mixture of different waves of ultrasound, strong flashing lights and sound alarm to scare away animals. There is no danger to human or animals. There is a solar panel on the head of the device Let the device absorb energy when the sun shines. In addition, it is equipped with a 2000 mAh rechargeable lithium battery. You can also charge the ultrasonic mosquito repellent via USB power supply. This product does not include a USB cable. IP66 waterproof and easy to installThis cat repellent is IP66 waterproof. It is able to withstand normal rain. Note: If there are thunderstorms or bad weather, it is recommended to take it indoors. Can be installed anywhere in the house, garden or patio, courts, driveways, fields, lawns, edges, garages, farms and all outdoor areas.