Dog repellents emit only ultrasound in the range of 13.5 kHz to 45.5 kHz, which is safe and harmless to humans. At the same time, it is free of chemicals and hazardous substances. It is designed to guide animals without causing harm. The humane design will not harm your cat, dog, or other pets. [Infrared Sensor] The nose of the Owl Defense System is an infrared sensor (PIR) that detects animals of any size. The effective range is a 110° arc up to 60 m. As soon as the pet comes closer than 60 m, the motion sensor emits ultrasound, and the LED lighting unsettles the pet and causes it to flee. [Ultrasonic, Strong LED Light, Alarm] The owl's eyes contain 6 strong LED lights. Its mouth is an ultrasonic transmitter. When an external repellent detects movement and body temperature, it emits a mix of ultrasound of various wavelengths, intense flashes, and audible alarms to scare the animal away. Safe for humans and animals. [Solar Powered] The owl's head is equipped with a solar panel. Allows