Smart trigger,The PIR sensor can be used as a smart home sensor, and with the help of APP and server, it can transmit startup conditions to the back-end device.For example, after the sensor detects an alarm, it can automatically turn on the sound alarm or turn on the light Infrared induction,PIR sensor not emit any light or radio when it is ready to detect. It not be detected in advance. People or animals passing by have body temperature. PIR detector can detect the infrared radiation from their body temperature, and then push the alarm information to app Low power reminder. When PIR sensor detects that the battery is low, it actively push the low battery message to the app. You not forget to replace the battery and make your home security vulnerability. Wide Angle.The PIR sensor provides 128 side wire, 128 down view, and provides an effective detection distance of 10 meters. The mounting bracket can adjust the detection angle of the sensor, and can adapt to more use scenarios Hign-concerned Chemical:None Wireless Type:WiFi Indoor Communication: 20 Meters Detect Angle Side View:128 Detect distance:10 Meters (The product appearance and printed words depending on the batch, but this does not affect use) Color:As Shown Material:ABS Package Contents: 1 * PIR Motion Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.