Fenix TK50 is a multi functional high intensity flashlight powered by two d batteries. By selecting the four brightness levels, it can reach max 255 lumens brightness levels or max 20 days run time respectively. it will meet various lighting needs with different functions in the flashing mode. Featuring in such great power, the rapid shift via the side button switches and its size much more compact than any other traditional lights powered by two D batteries, TK50 is the indispensable in outdoor searching, caving or using as a spare light for automobiles with its excellent performance and convenient operation.