This is a great concept but the functionality doesn't quite match the reality. I used this product for a week with light use before the lens cap started to fall off on its own. I've tried pushing the cap on firmly several times, but after a minute or two the cap pops open and releases the full stream. I bought this for my Strion Stinger, one of the flashlights that the manufacturer says this cap is compatible with. If the cap were metal instead of cheap plastic, it might have better functionality.
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