The CMG "o4" is a good compliment to any camping
kit or activity which requires the use of a close range personal
light. The fact that this little light is truly watertight
is an added bonus for a keychain sized light.
The "o4" is a little larger than some of the other
keychain lights reviewed in the past, but still small enough
to remain relatively unobtrusive in the pocket.
The momentary-on switch is very sensitive and requires surprisingly
little pressure to turn on. This could cause the light to
turn on in your pocket or pack, so it would be wise to pack
it in such a way that the chances of this are minimized.
The constant-on lever, although appearing to be an unconventional
solution, does work very well. When received it did not keep
the light on constantly, but a slight tightening of the screw
that holds the lever in place (as directed by the included
instructions) fixed the problem. There is a probability that
the lever could get caught on things, as it protrudes from
the side of the body of the light.
The shape of the light, with the larger "head"
opposite the split ring attachment area makes this light very
handy as a zipper-pull for a jacket. The lithium batteries
are impervious to cold, and the light is watertight, so it
would make a good addition to a winter jacket zipper. Plus
you'll always have the light with you.
The LED only comes in white, but the plastic surrounding
the LED comes in various colors. The colored translucent plastic
bodied lights I have seen light up a little bit when the LED
is turned on, allowing the light to serve as a marker to some
+ + + Pluses: Durable, Watertight, Constant-on switch,
Can be held in mouth comfortably
- - - Minuses: Lever may catch on things, LED exposed
to potential damage, case requires tools to open, could come
on accidentally if pressed against something in pocket/pack