The Littlest Headlamp

Or book light. Or bike light. Or anyplace light. At 1-3/16" dia x 1-1/4" deep, it weighs approx nothing but has a very bright, single white LED with a collimating lens. It's in black plastic and mounted on a little spring clip which has an 11" long, adjustable elastic strap threaded through it. The light swivels 90° on the clip. Wear it around your head, on your wrist, arm or leg; clip it to a book, clipboard, a car or hat visor, the dog, a bike part, a tent flap. Runs on (2) coin batteries, included, and you tighten the lens holder to turn it on. Can you say "versatile?"