Fenix Flashlights TK35 1800 Lumens Ultimate Edition Flashlight, Black Max 1800 lumen output produces amazingly wide 75 degree beam with dual tail switch for momentary-on and output selection Six outputs including SOS and strobe Made of durable aircraft-grade aluminum with type iii hard anodized finish; waterproof to ipx-8 (2 meters for 30 minutes) 6.5In (Length) x 1.7 Inch (body diameter) x 2 (head diameter) Uses two 18650 rechargeable li-ion battery or four cr123abatteries (not included)