Designed for the broadest range of lighting applications at the best value. Durable, waterproof construction ensures continued use in many different extreme conditions. Material/Lens : High impact super tough nylon polymer for exceptional durability, a superior grip texture provides a comfortable, but slip-resistant feel. All openings o-ring sealed for weather resistance. Dims/Weight - Length: 5.34 in. (13.56 cm); Body Diameter: 1.00 in. (2.54 cm); Head Diameter: 1.25 in. (3.18 cm); Major Diameter: 1.36 in. (3.45 cm), 4.2 oz (121 grams) with batteries Light Source: C4 LED technology, impervious to shock with a 50,000 hour lifetime Switch - TEN-TAPA(R) programmable switch allows user selection of one of three different programs: high/strobe/low (factory default), high only, or low/high Battery - Two 3V CR123A lithium batteries (included) IPX7 waterproof to 1 meter for 30 minutes; 3m impact resistance tested