This Maglite Flashlight has two, high-intensity, White Star Krypton Gas Lamps for an enhanced brilliance and extended range. It is also O-ring sealed for water resistance and has a spare lamp safely secured in the tailcap in case an extra replacement is needed. Adjust from spot to flood with just a 1/2 turn of the head. This drop-resistant and water-resistant flashlight is renowned for its quality, durability, and reliability.