Expired Jan 2015 but good for many more years. ChemLight is a military grade chemical light stick that can be seen up to a mile away for up to 12 hours in optimal conditions. Each light stick is individually foil-wrapped for protection from light and moisture. 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. Features ChemLight military grade light stick provides bright, reliable light for up to 12 hours Measures 6a ^2 long and provides 360 degrees of illumination Four-year shelf life from date of manufacture for a maintenance-free alternative to other lighting Meets military specifications: DLA, NAMSA Chemiluminescent substance is non-toxic and plastic body is phthalate free for safety