The Magnetic Light Mine is a small (approximately 40 mm across) plastic ball with 12 individual magnets placed around the surface.
It weighs 22 grams (3/4 oz.). The magnets hold the ball on a piece of ferrous metal and a single LED light can be engaged to provide a minimal amount of light for emergency use.
The Magnetic Light Mine is more of a novelty or curiosity than anything else, in my opinion.
The magnets don’t seem very powerful and their orientation means that they don’t sit flush to the surface of the item that the Light Mine is attached to.
It doesn’t stick very well to tubular frames either, especially if they have a thick powder coat, like the Ducati.
The single LED light isn’t very powerful; it’s sort of like one of those keychain LEDs. Just enough light to get the key into the hole, but not much more than that.
I tried it in several orientations on the bike at night, and I suppose it’s handy in that it can allow a hands-free evolution, but I’d rather spend the 7 bucks on something like a Gordon LED flashlight (review), still one of the best LED bargains around.
The Magnetic Light Mine uses 3 small replaceable LR44 watch batteries.
Don’t forget that the magnets may affect electronic devices, media and credit cards.