1. The protocols of smart PIR sensor is Zigbee; 2. Zigbee smart PIR sensors requireZigBee gateway, please purchase in addition; 3. The battery is not included in the package.<br><br>About Monitoring Principles:1. The sensor uses infrared background radiation as the inspection principle: 2. During installation, it is necessary to avoid direct sunlight and other heat sources, as they may interfere with the inspection results. 3. It can only check the changes in background radiation and cannot monitor the movement of background radiation Colour:White Material:plastic<br><br>Package Contents: 1 x Smart PIR Sensor(2 AAA batteries not included)<br><br>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.