Nu-Flare Ultra- Compact 78R91AA Luxeon Rebel 90 6W LED Flashlight - Zoom Focus, Use One AA Battery 100 Lumens, Bright and Efficient Energy saving Power LED technology, around 8 to 10 times better energy efficiency than light bulb GREEN Technology - 1 hour battery life at 100 Lumens using cheap AA battery, compact size for everyday carry Luxeon Rebel 90 (3rd genereator Luxeon LED, 100 Lumens, about 2 times brighter than most 0 3D cells Maglite ) It has simple tail tactical switch click on and click off. The focus is adjustable from 1X to 4X (patented) High quality solid state DC-DC regulated circuit (other are DC-AC-DC non-regulated) maintain maximum light output throughout entire battery life.