Intelligent Detection • By sticking the product to the door or window, you can check the opening and closing status of the door or window at any time. • Instant alerts whenever a door/window opens or closes unexpectedly*, for added peace of mind when your child is on the move. Easy, tool-free installation • Attach with double-sided adhesive strips, anywhere you want. Smart Connection • Create usage scenarios via the Mi Home / Xiaomi Home app by interconnecting with other smart devices*, such as your connected camera, air purifiers or light bulb. Light Intensity Detection • 2-in-1 light sensor for more complex day/night scenarios. • When the light sensor detects that the ambient light is low, it can trigger your lighting*.