Wireless Door/Window Sensor can be placed on your door or window to notify you by an alert notification if your door or window is open or closed, adding an extra layer of security to your home. The opening and closing status of the door/window is synchronized to your mobile phone. ZigBee Bridge is required. The sensor gives you the ability to create a scene link between ZigBee and Wi-Fi devices. This sensor is able to help you create a smart home. Working in harmony with the ZigBee Hub Bridge, you can stage a scene so that your hallway is lit up as soon as the door is opened. Share with FamiliesShare the sensor with your family to give them the ability to quickly control and monitor your home together. 3 month history check. Simple InstallationInstallation of 3M adhesive (included) saves you a considerable amount of time. Its application can also extend to wide areas such as drawers, garage doors, blinds, etc. Just stick it to a place where two things are connected and it is still safe, even if you don't monitor it. Camera Linking The camera function can be activated on the sensor page in the eWeLink APP, which also allows you to clearly see who enters your home; you can even scare the stranger and ask them to leave your home immediately through the two-way audio function.