... .high efficacy,long lifespan,maintenance free 2.Osram/Cree led recourse 3.attractive shape 4.Opposing polarity protetive Features and ... benefits1.Made of top famous LED source Cree/Osram, high efficacy, long l ifespan, maintenance ... , petroleum and petrochemical, aircraft, mi l itary, outdoors, indoors, portable-emergency kits.Working temperature: -20°C to +40°C