my mag instrument s4d016 black heavy duty 4 D-Cell Flashlight get a lot of use . this be the one -lrb- and the 6d-cell -rrb- light that lot of law enforcement carry . it be effective as a flashlight and as a tool if the use of force need to be escalate in subdue a bg -lrb- bad Guy -rrb- - order give with confidence and with commanding voice , physical force include night stick or mag light , side arm , shot gun -rrb- . there be a lot go on within the technology of flashlight recently . LED , Lithium battery , focus bezel , etc. . the mag have fall from grace a bit technologically , but be still a great flashlight for police \/ emt INCLUDING look for criminal , terrorist or signalling for a chopper pick up . the Mag Instrument S4D016 Black Heavy Duty 4 D-Cell Flashlightt be very durable and they be prove reliable . but even the police and emt and military be switch over to more tecnologically advanced product and technique to go along with the new equipment . . they have to . they life and the life of other depend on the best equipment available . and for a long time that be Mag Light . do not get I wrong . I have depend on mag lite of all size for year . but head to head , thesurefire brand have quickly surpass mag lite in every importantant aspect of flashlight - usable light power , size and weight . the Mag Instrument S4D016 Black Heavy Duty 4 D-Cell Flashlight be a good value and I have several in the house and the vehicle . but they be be replace by surefire as they wear out . John Row