The Fenix E20 V2.0 AA flashlight has been upgraded to be brighter and better than its predecessor. Powered by the included AA batteries. It has a maximum output of 350 lumens and the tail switch operates all functions including on/off and four brightness levels. At only 5 long, this flashlight is a perfect everyday carry size. The Fenix E20 V2.0 also features a patented ultra-thin optical lens with an automobile coating which reduces weight and allows for clearer vision. This flashlight is built rugged with a hard-anodized aluminum finish and an IP68 rating; dust-proof and waterproof underwater to 2 meters. The Fenix E20 V2.0 flashlight is a great option for those looking for an affordable standard AA powered flashlight in a compact everyday carry size.E20 V2.0 Size:Length: 5.0 (127mm)Body: 0.7 (16.8mm)Head: 0.8 (21mm)E20 V2.0 Weight:1.5 oz. (42g) excluding batteriesE20 V2.0 Battery:Two alkaline AA batteries. Ni-MH batteries recommended for best overall performance.Included:Two AA alkaline batteries, spare O-ring, lanyardWarranty:Limited Lifetime Guarantee