Out-of-Stock Chemical and security lights Sturm MilTec Lightstick Signal Marker Yellow 12 Hours 14940015 kn15.20 Lightstick light signaling marker. They are non-toxic, non-flammable, waterproof and safe for tents. They are very easy to use.The Marker does not produce heat, making it reliable when used in confined spaces, in a tent or on a garment. Each marker has a ring and a hook that can be easily attached to clothing, equipment, or hanging on the rope. View