http://www.fenixlight.com/ProductMore.aspx?id=81&tid=9&cid=1#.UVT1uzezkf0
Features
·Cree XP-G2 (R5) LED with a lifespan of 50,000 hours·Uses one 3V CR123A battery
·89mm (Length) x 21.5mm (Diameter)
·44-gram weight (excluding battery)
·Digitally regulated output - maintains constant brightness
·Reverse polarity protection, to protect from improper battery installation
·Anti-roll, slip-resistant body design
·Tactical tail cap switch with momentary-on function
·Side mode switch button in the front, press once for brightness level selection
·Made of durable aircraft-grade aluminum
·Premium Type III hard-anodized anti-abrasive finish
·Toughened ultra-clear glass lens with anti-reflective coating