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These are a great little product, a perfectly acceptable no-name lookalike/knockoff of a much more expensive manufacturer's light. Surprisingly bright, I can't guess the lumens, but bright. Buy a bunch and scatter them around the house, car and drawers --one on every keychain, toss one in your shirt pocket just in case you wind up staying out after dark on your dog walk, Great for travel, put one on your carryon bag's zipper pulls for finding items in the dark airline cabin at night. Great for UL backpacking or camping. Great gifts to friends.A lot of these come out of Asia with wide variations in quality control and brightness so the batch you get can be hit or miss, but if 8 out of 10 are acceptably bright you've still got a bargain. Battery shelf life seems to be from one to two years. Theoretically you can unscrew and replace the batteries, I haven't tried ( batteries will cost more than ordering new lights). Look for '22000MCD' or higher when shopping for brightness; anything lower may be a less-bright knockoff of the knockoff.
They also have a constant-on clickable switch. I've never run one to exhaustion so I don't know their run time. In 30 and 60 second bursts of use, they last a long time. Some that have been sitting in a drawer unused for a year (or two? three?) are now at various stages of dimming so they don't last forever. But a bright light, for well under a dollar each, with zero bulk and zero weight? Priceless.
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