The Door Occupancy Indicator uses intuitive red and green window displays to let outsiders know at a glance whether a room is occupied or vacant. It features a circular panel with a diameter of 50mm and an internal handle approximately 85mm long. The panel includes a 23mm Φ mounting hole in the center and an 8mm Φ fixing screw hole. Separate accessories with a 22mm diameter are also included, creating a compact and rational design.