Complex engineering makes for superior headlamps. Each Professional Series headlamp goes through aprocess of three overmolds, ensuring that the lens, battery compartment, and button are all molecularlybonded to the housing. The result is extreme durability and water resistance.When the US Military makes a request, Princeton Tec takes action. The Remix Pro is powered by a single CR123 battery providing excelled performance in cold weather, light weight and compact size. While having multiple output modes to meet various requirements, the light always starts in low mode. Combining these features with a large on/off button, an easy access battery door and a reliable asymmetrical bracket,The Remix Pro is equipped to endure the rigors of your next adventure.