Powered by two 123A lithium primary batteries, the X300T-B generates 56,000 candela of high-intensity into a compact, handgun-practical form factor. In addition, all Surefire high-candela WeaponLights feature reliable, intuitive switching, and they can be accessorized with the most comprehensive switching options in the industry. SureFire Turbo Series models are engineered to take a beating and thrive in any environment, just like when Surefire pioneered high-candela illumination tools two decades ago. There's no room for compromise when you depend on your equipment to save your life. That's why every SureFire Turbo Series model is constructed of rugged, lightweight aerospace aluminum, Mil-Spec hard-anodized, and O-ring sealed to keep out the elements. As a result, they're the best-performing, most feature-rich illumination tools in their class. Some things never change.