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Here is a link to the product on Amazon: http://amzn.to/ZUldg6
I would likely carry this in my pocket (not sure if that counts as "concealed" or not. Obvious use case is a self-defense situation where life is threatened.The "Emerson Wave" feature is a small piece of metal/plastic that catches the pocket as you pull the knife out and causes the blade to come out. It's still a manual opener, but the piece of metal acts like your fingers as you pull it out.