The Cyalume ChemLight is a white military grade chemical light stick measuring 6" long, for providing instant 360 degree illumination, that can be seen up to a mile away for up to 8 hours in optimal conditions. The ChemLight is waterproof, non-toxic, and non-flammable. To activate the light stick, bend, snap and shake the tube. The light stick has a hook and gate top, for hanging or attaching the light. The ChemLight meets Defense Logistics Agency (DLA) and NATO Maintenance and Supply Agency (NAMSA) specifications, and National/NATO Stock Numbers (NSN) are printed on each product. Each light stick is individually foil-wrapped for protection from light and moisture, and has up to a four-year shelf life from date of manufacture.