Lithium Battery Included (ready to use) 

LED Flashlight Keychain ---------  Really Cool Gift!
Shines an astonishingly bright beam illuminating any path
Two modes of operation: momentary on when squeezed and a constant on slide switch with practically unbreakable LED
Lithium battery with long reliable shelf life (works when you need it)
Comes with keychain loop to be used as a keychain or can be attached to an existing keychain, zipper, etc.
Put one on all your family's keys, zipper pulls, & emergency packs.
Ours is better! (1) The lithium battery in our light can be replaced.  Just open the case with a small screwdriver.  (2) This light was found to be much brighter than other tested samples. (3) Has both squeeze type on/off (momentary only ) and positive slide type on/off (light stay on)