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http://www.goodtradeusa.com/koehler.php Mark V (5200 Series) 5200 Series Cap Lamps feature a smaller, Lexan headpiece which provides high impact resistance and a lighter weight. Also features a fully focusable dual filament Xenon bulb and a slide type connection of head-piece to charger. a.. Ejection mechanism for bulb b.. Locking plate over battery connectors c.. Bezel Lock d.. Focusing Spot to Flood e.. Superior Impact Resistance f.. Non-Conductive Battery Top g.. 1 year warranty h.. 3 - 4+ year battery life Koehler Wheat Cap Lamps are approved for use in methane-air atmospheres by the U.S. Mine Safety and Health Administration (MSHA). Mark V Wheat Cap Lamps feature an intrinsically-safe battery, a specially-designed highly flexible cord, and a dual filament Xenon bulb with both filaments fully focusable. A single knob controls all switch and focusing functions. Lamps are charged through their headpieces. Find out more about Koehler lights at: http://www.koehlerlighting.com/about-us.asp