Cree XP-G (R5) LED with a lifespan of 50,000 hours Uses two 1.5V AA (Ni-MH, Alkaline ) batteries 156mm (Length) x 21.5mm (Diameter) 60-gram weight (excluding batteries and body clip) Digitally regulated output maintains constant brightness Reverse polarity protection guards against improper battery installation Anti-roll, slip-resistant body design Push-button tail cap switch with momentary-on function Side mode switch in the front, fast and convenient Made of durable aircraft-grade aluminum Premium Type III hard-anodized anti-abrasive finish Toughened ultra-clear glass lens with anti-reflective coating Specifications: Cree XP-G (R5) LED with a lifespan of 50000 hours uses two 1.5V AA type batteries(Ni-MH or Alkaline) dimensions: L 156mm x W 21.5mm (diameter) weight: 60 grams (excluding batteries and body clip) output: max. 190 lumens four brightness levels: Low (3 lumens) 110h burn time Mid (42 lumens) 15h burn time High (92 lumens) 5h59min burn time Turbo (190 lumens)2h26min rapid strobe hidden SOS intelligent memory circuit digitally regulated output maintains constant brightness reverse polarity protection guards against improper battery installation anti-roll slip-resistant body design push-button tail cap switch with momentary-on function side mode switch in the front fast and convenient made of durable aircraft-grade aluminum premium type III hard-anodized anti-abrasive finish toughened ultra-clear glass lens with anti-reflective coating