The dog repellents only emit 13.5kHz-45.5kHz ultrasonic which is harmless to humans and harmless to humans. At the same time, it is free from chemicals and hazardous substances. He only guides the animals without hurting them. The humane design will not harm your cat, dog or other pet. Infrared Sensor The Owl Defense System Nose is an infrared (PIR) sensor that detects animals of all sizes. The actual range is 110° arc up to a distance of 60M. Once the pet enters within 60M, the motion sensor will emit ultrasonic sound and the LED light will make the pet uncomfortable and escape. Ultrasonic, strong light LED, alarm There are 6 strong light LED lights in the owl's eyes. As for his mouth, he is an ultrasound emitter. When an external repeller detects movement and body temperature, it Note: The data is manual measurement, please allow 1-61cm error, due to differences in light and screen, there will be a certain color difference, the specific received in kind prevail.