Special operations-light emitting diode (SO-LED™) a handy little LED light that clips almost anywhere.
These bright orange cased lights were manufactured for a local emergency services group to clip on to their vests and emergency equipment. The extras are available here.
This handy little light was redesigned by a members of a local special operations team to provide a small amount of light when and where they needed it like maps, documents, simple navigation, identification. This was quickly discovered by Paramedics as the answer to their low light documentation problems and word of it's multiple uses spread from there.
What make this light unique, is it's eight position 360 degree ratcheting rotary clip with strong jaw and thin rugged body.
Have been buying these for years, handing them out to friends and family as keychain, reading, and emergency lights. I don't use mine all that often but I've yet to have the batteries run out. BTW, if you want to put it on a keychain it's easy to remove (and reattach) the clip by unscrewing a couple of screws.