You know what the problem is with flashlights these days? They all brag about high lumens and how bright they are, but they only run for a short time before the brightness dims down. Heck, they don't run that long at all, even in eco-mode. Well, not this one. Not the ML300L™ 4D LED Flashlight by Maglite. It's got 1.002 lumens and our patented LED Heat-Sink Technology allows for longer performance. On HIGH setting, it can run for more than 5 hours. The beam throw is half a kilometer (511m). That's more than 5 soccer fields! But that's not the most amazing thing about it. In eco-mode, it will run for more than two weeks nonstop with usable light. That's 18 days, to be exact! All it takes is 4 D-Cell batteries. Maglite®'s patented LED Heat-Sink Technology is what allows this beast to perform the way it does. No worries about overheating. And years from now, when other flashlights stop working, all you have to do is pop new batteries in and the ML300L™ 4D will continue to perform for you. It's "built like a tank" - as a customer would say. And it's an iconic design, not one of those ugly flashlights! It's a must-have for every home and on every trip (for work or play). Whether you need it for an emergency or a camping trip or the next music festival, please make sure you don't get caught in the dark without the ML300L™ 4D LED Flashlight by Maglite®!