Huh! I didn't notice the button at first. It's a flashlight. Yes. I ended up on a Japanese language website, where this fella sells his knives. First of all, everything there is just as glorious as this. Second, he also builds flashlights. If you look at the bottom of the pommel, you can kinda see where the LEDs are. I guess the battery is between the slabs, so you have to take th knife down to change the battery. Like I said, the website is all Japanese, so I don't know much.