This is an SDU-5/E strobe light used by the US military. ※ This is a non-functional junk item. Please use it for display or cosplay purposes. The SDU-5/E is a personal distress signal light used to signal rescuers of one's location in a distress situation. This light is known as part of the personal survival kit used by Air Force pilots. It is marked "LIGHT MARKER DISTRESS," indicating its function as a distress marker. Color: Orange