The Cyalume ChemLight Tactical is the premium grade military light stick designed specifically for military and tactical use. Measuring 6 inches long, each stick can provide instant 360 degree illumination for 12 hours or more. This light can be seen up to a mile away (on land) in optimal conditions. The ChemLight Tactical is waterproof, non-toxic, non-flammable and floats. To activate the light stick simply bend, snap and shake the tube. The light stick has a hook and gate top, for hanging or attaching the light to carriage equipment and clothing. These light sticks meet various International defense and NATO specifications and has up to a four-year shelf life from the date of manufacture.