though this 2d model be slightly smaller than the 4d model that many people be familar with , this model be just as useful . in fact , I prefer the 2d model because it be easier to handle and not as awkward to carry as the longer 4d model . the light in this baby shine bright enough to almost completely illuminate a small room . if you so desire , you can focus the beam or let it spill out . the bulb hardly ever have to be replace and even if you use the inexpensive battery , they do not need to be replace as often either -lrb- the light suck all the juice out -rrb- . besides just be a great flashlight , the mag-lite 2d also work well as a club -- you can actually knock someone out cold . a great tool ; one that every home should at least have one of .