signals, which are transmitted to mobile phones via Bluetooth. The status signals can be uploaded to the server to achieve remote
monitoring, intelligent care, abnormal reminders, scene linkage, etc.
2. By detecting the opening and closing of doors and windows, the S4 can wirelessly notify users of arrivals and departures. The
two-piece S4 consists of a main body, mounted to the door or window frame, and a magnet, to be mounted to the door or window. It adds security and automation to the existing smart IoT system.