Ultrasonic Protection Dog repellers emit only ultrasonic waves from 13.5 kHz to 45.5 kHz, which is safe for the human body and harmless to the human body. At the same time, it does not contain chemical and dangerous substances. It will lead only animals without harming them. The humanized design will not harm your cats, dogs or other pets. Infrared SensorThe nose of the owl repellent is an infrared sensor (PIR), which can detect animals of all sizes. The actual area covers an arc of 120 degrees and a distance of up to 30 feet (10 m). Once the animals enter within 30 feet radius, the motion sensor emits ultrasonic waves, and LED lighting makes the animal uncomfortable and escapes. Ultrasound + Strong Flashing LED + Sound AlarmThere are 14 strong LED lights in the eyes of the owl. As for its mouth, it is an ultrasonic transmitter. When the external repellent detects movement and body heat, it emits a mixture of ultrasound of various waves, strong flashing lights and audible alarm to scare off animals. There is no danger to humans or animals. USB Charge and Solar Power There is a solar panel on the head of the owl. Let the owl absorb energy when there is sun. In addition, it is equipped with a rechargeable 2000 mAh lithium battery! You can also charge the ultrasonic repellent via USB power. 5 ADJUSTABLE MODES The irregular and variable frequency makes it more effective to drive away more aggressive animals that can adapt and become immune from a particular frequency band. IP66 waterproof and easy to installThis cat repellent is IP66 waterproof. It is able to withstand normal rain. Note: If there are thunderstorms or it is bad weather, it is recommended to take it indoors. It can be installed anywhere in your home, garden or patio, gardens, yards, driveways, fields, lawns, borders, garages, farms and all outdoor areas.