This Streamlight Twin-Task Flashlight features a high-pressure xenon bulb; plus 3 ultra bright, white LEDS. It has 72 lumens with the xenon bulb; 25 lumens from 3 LEDs -Up to 2.5 hrs. run time (xenon); up to 28 hrs. (3 LEDs) -Powered by two 3V CR123A lithium batteries (included). The length is 5.43" and the weight is 5.44 oz.