The Cyalume SOS signaling device is a 6.25a ^2 green light stick attached by a 30a ^2 lanyard to the protective plastic outer casing that acts as a handle, which is spun to create a distinctive four-foot circle pattern that can be seen for one mile on the ground, and up to three miles away from the air, in optimal conditions. ChemLight Military Grade SOS signaling light stick for providing illumination for up to 8 hours Measures 5.25a ^2 long and provides 360 degrees of illumination Made in USA Chemistry is non-toxic, non-flammable, and plastic body is phthalate-free for safety Four-year shelf life from date of manufacture