Regarding the product: 1. The product uses infrared pyroelectric sensors. The sensitivity of the sensor to animals is related to the direction of their movement. It is not sensitive to radial movement but is most sensitive to cross-cutting movement. The meaning is: If the animal is stationary or approaches the product in a straight line without making a cross-cutting movement, the infrared sensor cannot detect it, and the product cannot work on the animal. 2. It adopts the infrared detection principle and emits ultrasonic waves to drive away small animals while detecting them. It can help you stay away from the harassment of annoying stray dogs, stray cats and other small animals, thereby protecting your property, your garden and your courtyard. As a portable design product, it can be installed anywhere in your home, garden or courtyard. This product can be used with a low-voltage power supply and a battery. This product only drives away animals without any chemical substances. It emits ultrasonic frequencies to drive them away. 1) Speaker: This product can emit high frequencies to drive away animals. 2) PIR movement detector: This is an infrared sensor that continuously outputs signals. When it senses a moving animal within the detection range, it will automatically emit sound waves to drive the animal away and the LED indicator light will also light up. 3) When the infrared sensor detects that the animal has moved away, the LED indicator light will automatically go out.