S.E.E. System Refill Features: Refill ChemLight light sticks for S.E.E. emergency evacuation system Includes ten 6a ^2 yellow ChemLight light sticks that automatically activate when the SEE system box is opened Includes expiration labels and replacement tamper pins ChemLight high intensity light sticks provide up to two hours of illumination Provides a light source in case of a power outage Chemiluminescent substance is non-toxic and plastic body is phthalate free for safety