These little 1.5 inch long PICO lite LED flashlights can project a 10 lumen beam up to 30 feet. They have a small clip that you can use to hang them from a jacket zipper pull so that you’ll always have a flashlight when you need one. You can get one for $9.95 at eGear.
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I was in a big earthquake some years ago. All the lights in the building went out. I was in a room full of equipment that fell down. Not fun trying to pick my way through that completely blind. This could be a life-saver in many situations.