The Option Flashlights feature Gerber's patent-pending Omnivore Interchangeable Battery Technology. The body of the flashlight is engineered from aircraft-grade type II hard anodized aluminum for lightweight, rugged durability. The light has an aluminum tail-cap switch, lanyard hole and comes with a sheath. Two models available: Option 60, with 60 lumen output that runs on two AAA, two AA or one CR123 battery; and Option 50, with 50 lumen output that runs on one AAA, one AA or one CR123 battery. Both lights have a burn time of four hours.