this be my favorite flashlight because it be light , compact , very durable , and fit my application . it do have its drawback though -lrb- which I see as a positive -rrb- : 1 . it have a traditional incandescent bulb , NOT lead -lrb- which I prefer since the light be yellowish-white instead of the harsh white of a lead -rrb- 2 . because it do not use a led bulb , the battery drain very quickly -lrb- I notice the light come out of it get considerably dim after about a hour of use , but it be still work . I have rechargeable battery so this be not a big deal . -rrb- 3 . it do NOT produce a lot of light -lrb- it be great for application where you do not need or want too much light -rrb- overall , it be a good flashlight -lrb- and you can put it on you key-chain -rrb- , but it do have its drawback and be not for application which require a lot of light or long battery life .