[Advanced Motion Sensor]PIR detects human body or animals that are moving, 120 detection angle, 5m detection distance, can achieve real-time monitoring day or night. [Emergency Alert Push Function]When there is movement detected, the alert notifications be pushed to your phone, be aware of what's happening even when you're away. [History Records Tracking]You can track the history of sensor activities. [Strong Performance & Ultra-long Standby Time]Long transmission distance, high sensitivity, and strong network signal. Ultra-long standby time. Powered by 1pcs CR2450 batteries(include), can last for about 18 months. Please note: This product must be used with a Zigbee gateway! (not included) Specifications: Product name:ZigBee human motion sensor Networking form: ZigBee3.0 Mesh Detection:120,distance Less than 5M Power input:Cr2450 button battery(1.5 years,10 times per day) working temperature:-10C~45C Product size: 33mm x 27mm Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Material: plastic colour: White Package Contents: 4 x 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.