Tektite marking and distress signal strobes are the choice of maritime users, scuba divers, militaries, fire fighters and outdoor enthusiasts worldwide. Our rugged and waterproof strobes can be seen for miles at night and are designed to operate in almost any environment. Used for Distress, SAR, LZ, DZ and position marking. Infrared (IR) versions of our strobes are available for military and police use. Quality alkaline batteries are included.