The M3XS-UT offers up to a full kilometer of beam distance and features a large diameter reflector with dedomed CREE XP-L High Intensity LED's. The light has three brightness levels from 3-1200 lumens, plus a strobe mode. The M3XS-UT is powered by 3 x CR123A Lithium batteries. When the light is assembled with the extension tube, it can be powered by 4 x CR123A or 2 x 18650 batteries (with protection board). The M3XS-UT retains the tail cap switch design from the M3X for tactical operation, with an added side switch on the head of the flashlight that will allow for easy mode switching. The tail cap on the M3XS-UT is brand-new conductive stretch that keeps the light energized even when the tail cap is loosened accidently.