• Cree XP-G LED (R5) with lifespan of 50,000 hours • Uses two 3V CR123A Lithium batteries or a18650 Li-ion battery • 135mm (Length) x 25.4mm(Diameter) x 34mm(Head) • 120-gram weight (excluding batteries) • Digitally regulated output - maintains constant brightness • Patented structure avoid circuit damaging from reverse connection of battery • Tactical tailcap 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