Xenon gas-filled bi-pin bulb with 30 hour life; spare bulb in tailcap adjustable focus beam polymer construction with non-slip grip up to 15,000 candela; 125 lumens 3 cell 3.6v sub-c nicd battery is rechargeable up to 1,000 times lightweight, powerful, rechargeable flashlight with super-tough, non-conductive nylon polymer construction that makes it virtually indestructible. up to 1 hour continuous use.