The MiniStar31M-EX is the ultimate LED conversion for your 4-6 D-cell MagLite. 1,000 lumens of pure, white LED light, LEDSense thermal management, multi-mode or single-mode functionality, 3 precision optics, and unsurpassed, field-tested durability deliver the performance of flashlights costing much more. Take your MagLite into the next realm of performance with a MiniStar31M-EX LED Conversion. Fits MagLite 4-6 D-cell flashlights Multi-mode function: (high/medium/low), user configurable to single mode via switch on side of module Electronically regulated for constant light output Extends battery runtime Approximate runtimes: 2 hours on high (1,000 lumens) 6 hours on medium (500 lumens) 37 hours on low (<100 lumens) Saves money- stop replacing bulbs Includes LEDSense thermal management for maximum light output and reliability under the most extreme conditions