Easy to install. 3M double-sided tape (included) can be used to attach the sensor 24/7 Professional Monitoring: Smart PIR sensor provides comprehensive monitoring of your home. Use it in a room or anywhere you want to be notified when there is movement or movement. Capture each activity and send an alert to your Android or Apple phone. It's easy for you to keep an eye on your home security anytime, anywhere Quick instant alerts: When it is triggered, such as human movement or motion, instant notification will be reported to your smartphone within 3-10 seconds depends on internet speed. Built-in redial function allows the PIR sensor to automatically connect to the network after resetting the Wi-Fi router Works with other AIIAT smart products: With the AIIAT smart plug and you can create your own scenes such as socket or home appliance can be turned on/off automatically when movement or movement is detected 【Two modes switches】: There are two modes for this sensor. 2 and 4 minute mode. The sensor will detect the first movement instantly and then wait 2 or 4 minutes before detecting the next movement. This will prevent false alarms and also save battery life. You can choose what you need Number of shipments: 1pcs (without battery)