The Fenix TK35U2 can generate up to 860 lumens using the newest CREE XM-L U2 LED. The TK35 features four brightness levels, two different flashing functions and a signaling mode. Its dual button switch allows you to transfer brightness levels rapidly with one hand so you can get the light you need with ease. The unique design of the battery holder saves on size makes for an incredibly comfortable-to-hold light. The TK35 is powered by 4 CR123 batteries or 2 18650 rechargeable li-ion batteries. Features Max Output: 860 lumens/1.5 hours Throw: 340 Meters Cree XM-L U2 LED with a lifespan of 50,000 hours Uses four 3V CR123A batteries (Lithium) or two 18650 rechargeable batteries (Li-ion) (Batteries not included) Dimensions (Length x Diameter, Head Diameter): 6.5" x 2" x 1.72" (164 x 51.5 x 43.64 mm) Weight: 9 oz (256 gram) (excluding batteries) Reverse polarity protection, to protect from improper battery installation Dual button switch in the tail cap, convenient operation Made of durable aircraft-grade aluminum Premium Type-III hard-anodized anti-abrasive finish Toughened ultra-clear glass lens with anti-reflective coating UPC: 6942870301013