The Cyalume Mini ChemLight is a military-grade chemical light stick that measures 1.5" long, provides instant 360 degree illumination for up to four hours, and is suitable for military, law enforcement, and public safety applications. The ChemLight is non-toxic and non-flammable, and it is waterproof and windproof for use in severe weather. To activate the light stick, bend, snap, and shake the tube. Mini Type A.