We'll ,I purchased 3 of the knifes. 1 for myself, and the other 2 for my Sons. The Boxes they arrived in ,each individually are Taped Shut. I opened mine and looked it over. Unfolding the light out to see how well it worked. It has to be turned about a 1/4 of a turn to come on. Unfortunately it doesn't light up. Not sure what the issue is. I will give my Sons their Knifes in a couple weeks over Labor Day Weekend. Hopefully their lights work when activated. I would like a Replacement for mine and will wait and see how the other 2 work. Respectfully Thanks for your understanding, Rod Harding