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  1. J

    3.5W Engrving build

    i just got into lasers and bought a 3.5w 450nm module/TTL and will attempt to put in a flashlight. I'm thinkin on using 4 16340 batteries or is that not enough? its analog ttl but i dont see any button in the pic. any help would be greatly appreciated. I got excited and jumped in this to fast.