Ultimate Survival Technologies 15-Day Aluminum Flashlight Super bright and ultra heavy-duty flashlight emits 200 lumens Runs 15 days continuously on low setting off two D-cell batteries Runs 10hrs continuously on high with lifetime LED that is unbreakable and never needs to be replaced Made out of tough anodized aircraft-grade aluminum with silicone wrap for a sure grip Uses moonbeam technology to cast a broad, clear beam with no hot spots