Exclusive cam-driven beam changes from spot to flood with a turn of the head to give you a perfectly focused beam at any distance. A patented, self cleaning switch virtually eliminates the oxidation that accumulates in other flashlights. The result is an extremely reliable switch. Unlike other companies, we take the extra step to plate our contacts with the finest metals to enhance conductivity, reduce oxidation, and increase durability. Every reflector is computer designed to work with a specific lamp and power supply to achieve maximum brilliance and efficiency. A superior quality White Star krypton lamp delivers exceptional performance. A second White Star krypton lamp is included in the tail cap. Our high grade rubber O-rings at each opening ensure a Mag-Lite is exceedingly resistant to water and simply steadfast in its ability to withstand shock. An anodized finish inside and out offers optimum corrosion resistance and reduces the possibility of battery damage to the body. Our lower resistance circuitry allows a more efficient use of the batteries. In fact, batteries that have burned out in other flashlights will continue to power a Mag-Lite. Of course, every Mag-Lite flashlight is designed and manufactured in the U.S.A.