The Black Diamond Storm 450 Headlamp DF is for the technical consumer who wants the best, brightest, most waterproof, feature-rich headlamp to use for fast-paced, extreme environment activities. An added benefit is the DF or Duel-Fuel feature which allows the headlamp to run on alkaline batteries if caught away from a power source for a long expedition. Alkaline cells included. Settings include full strength in proximity and distance modes, dimming, strobe, red, green and blue night-vision, and lock mode. PowerTap™ Technology allows instant transitioning between full and dimmed power.