• Cree XP-G LED (R5) with a lifespan of 50,000 hours • Uses two 3V CR123A Lithium batteries or one 18650 Li-ion battery • 135mm (Length) x 25.4mm (Diameter) x 34mm (Head) • 152-gram weight (excluding batteries) • Digitally regulated output - maintains constant brightness • Reverse polarity protection, to protect from improper battery installation • Tactical tail cap switch with momentary-on function • Anti-roll, slip-resistant body design • Made of durable aircraft-grade alumi