Underwater Kinetics UK4AA eLED CL-AS2 Flashlight, Front Switch, Safety Yellow, Blister, Prioprietary Compound Path Optics (CPO) permits high efficiency and compact size Thermal Recovery System recycles heat from the LED to warm batteries for improved performance in low temperatures Certified for use in hazardous locations - Class 1, Div 1 "intrinsically safe" Push-button front switch switches light between ON/OFF with continuous or momentary action LED will not break when dropped and its life expectancy is well over 50,000 hours