• Cree XP-G LED (R5) with a lifespan of 50,000 hours• Uses two 3V CR123A Lithium batteries or a18650 Li-ion battery • 137.5mm (Length) x 25.4mm (Diameter) x 34mm (Head)• 119-gram weight (excluding batteries)• Digitally regulated output - maintains constant brightness• Patented structure avoid circuit damaging from reverse connection of battery • Tactical tail cap switch with momentary-on function• Anti-roll, slip-resistant body design• Made of durable aircraft-grade aluminum• Premium Type III hard-anodized anti-abrasive finish• Toughened ultra-clear glass lens with anti-reflective coating