Let's not split hairs over whether or not the Bullet 02 is really the World's Smallest LED Flashlight, when we could have a much more insightful discussion about how the barely-an-inch-long illuminator is waterproof, fireproof, keychain compatible, and looks a helluva lot like one of my ex-girlfriend's sex toys.
Which I don't think anyone would argue wasn't the World's Smallest Vibrator.
The Bullet 02 turns on and off with a twist. When activated, its seller says the flashlight outputs 20 lumens of light over a distance of a mile. I find that latter spec pretty hard to believe, but since the only thing I'd probably ever use it for is to find things located 1 to 10 feet in front of me, I guess it doesn't really matter.
The Bullet 02 Flashlight is made of anodized aerograde aluminum, and powered by 3 x LR41 button cell batteries.