Description: This Zigbee senosr and detector can not work standalone without gateway. 100% Brand New and High Quality 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 will be pushed to your phone, be aware of what's happening at home 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 12 months.