the Mag-Lite Solitaire be well design and well make but simply be not bright enough . however , if all you use a flashlight for be look for you key under the seat of you car or assist with read menu , it may be ok . it have a sleek design , and it be appeareance will not draw attention on a keychain . it function like any other -lrb- large -rrb- minus mag light , by twist the end where the light come out to turn it on and off . Change the battery by unscrew the other end . a spare bulb be conceal within the end cap . pro : - it be small . - it be well make , with all component fitting together smoothly , and a clean simple appearence . con : - it be just not that bright . some of the newer led flashlight be of a similar size but much brighter . overall , I would have to give this one a pass , unless I develop a fetish for small , well design gadget -lrb- like watch , watch be SOOO cool ! and miniature sextent , those thing be sooo neat ! -rrb- . ok , so I have this fetish , and this would explain why I have a Solitaire in my toolbox .