I buy this light to replace my battery hungry surefire light in my edc -lrb- every day carry -rrb- kit . prior to buy I do some research and my choice come down to this light for the follow reason . 1 -rrb- battery life : this technology allow the mini-mag light to run for 96 hour on the low setting , which be bright enough for regular task at night . 2 -rrb- lead : not only do this extend the useable time of you aa battery , it be bulb life be tremendous , usually into thousand of hour -lrb- although mag light do not state the life expectancy of this particular bulb -rrb- . 3 -rrb- feature : with a twist of the head , this light go from high beam to low beam to flash to S.O.S mode . this be a awesome feature . if you be ever in a situation where you need a third party rescue , just flip on the S.O.S mode and you that much closer to salvation ! and as with most modern utility light , the Mini-Mag LED be water and shock resistant . 4 -rrb- size : although it be slightly longer than my surefire m2 Centurion , it be a lot thinner and easily fit inside my EDC kit which you can take a closer look at on my blog at theseniorscout.com