Locate a man overboard in the sea at night or use as a light to aid navigation. This Red or Yellow 12 hour Cyalume Lightstick is a portable & cost-efficient source of light. Each lightstick is a pliable, plastic tube filled with 2 non-toxic chemical solutions, one held separate in a floating ampule to prevent activation until required. Sold individually. Two red and one yellow remaining- please message us during the check out process with which colour you prefer.