The "Cuil Fall Alarm" is a fall detection device that can be installed on the walls or ceilings of a room, enabling 24/7 continuous monitoring. Through 4D RF point cloud imaging sensing technology, it achieves real-time fall detection with active alarms and activity monitoring while ensuring privacy protection. Whether it's a quick fall, a slow fall, or a fall from the bed, as well as falls in different positions such as face-up, face-down or sideways, the device can detect them in real-time and issue alarms. It notifies caregivers or emergency contact persons automatically, serving as the last line of defense for the safety of elderly people living alone.