[Ultrasonic Protection]: Dog repellents only emit ultrasonic waves from 13.5 kHz to 45.5 kHz, which are harmless to the human body. At the same time, it does not contain any chemicals or dangerous products. It will keep animals away without harming them. Humanized design will not harm your cats, dogs or other pets. Infrared Sensor: The nose of the owl repellent is an infrared sensor (PIR) that 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 the LED lighting makes the animal uncomfortable and scares them. [Ultrasonic + [Strong Flashing LED + Alarm Sound] There are 14 powerful LED lights in the eyes of the device. As for the mouth, it is an ultrasonic emitter. When the outdoor repellent detects movement and body heat, it emits a mixture of different ultrasonic waves, strong flashing lights and an audible alarm to scare away animals. There is no