The Remix Pro is powered by a single CR123 battery providing excelled performance in cold weather, light weight, and compact size. Although the Remix Pro provides dual light output modes, it will always turn on in low mode on the Ultrabright setting. Combine these features with a large on/off button, an easy access battery door and a reliable asymmetrical bracket, and you can be sure that the Remix Pro is equipped to endure the rigors of your next adventure.