Fenix TK75 Package 2900 Lumens! Latest Version! 4 FREE RECHARGEABLE batteries & charger! Uses Cree XM-L2 (U2) LED with a lifespan of 50000 hours, Uses four 18650 rechargeable batteries 185mm (Length) x 52.5mm (Diameter) x 87.5mm (Head), 510-gram weight (excluding batteries), Digitally regulated output - maintains constant brightness, Low-voltage warning function Reverse polarity protection guards against improper battery installation, Dual button switch system Made of durable aircraft-grade aluminum, Premium Type III hard-anodized anti-abrasive finish