Fenix Flashlights 170 Lumens Flashlight (Upgraded), Black At just 2.3 inches long and weighing less than an ounce, miniature Fenix E15 light is compact enough to take with you anywhere Digitally regulated output maintains constant brightness; made of durable aircraft-grade aluminum with premium type iii hard-anodized anti-abrasive finish Reverse polarity protection, to protect from improper battery installation; cree XP-E LED with a lifespan of 50,000 hours At just 2.3 inches long and weighing less than an ounce, miniature Fenix E15 light is compact enough to take with you anywhere Digitally regulated output maintains constant brightness; made of durable aircraft-grade aluminum with premium type III hard-anodized anti-abrasive finish Reverse polarity protection, to protect from improper battery installation; Cree XP-E LED with a lifespan of 50,000 hours Uses one 3V CR123A lithium battery; 59.6-millimeter length and 19.7-millimeter diameter; 23-gram weight (excluding battery) Includes limited lifetime manufacturer's warranty