Since the early days of zinc-carbon and alkaline batteries, Duracell has led initiatives to ensure long-lasting, trustworthy power wherever it's needed, from your key fob to Tranquility Base on the moon. And we're just getting started. As portable devices became even more critical to our lives, so did the need for batteries. Duracell's Duralock technology enabled unused batteries hold their power for up to ten years, and Duracell Quantum Alkaline batteries were engineered with our High-Density Core technology to power portable devices longer and more reliably. The Duracell Durabeam Ultra LED Focusing Flashlight allows you to transition seamlessly between a wide spotlight for large-scale lighting and a narrow spotlight for long-distance observation in one easy swipe. Made of strong and durable aircraft-grade aluminum, this powerful 1500-llumen flashlight is virtually indestructible and features a tail cap switch for easy-to-use operation and four light mode settings for any environment.