For anyone looking for a key ring LED light, this one might interest you. It's called the V2 Nano Lenser, sold by Coast Cutlery Company, P.O. Box 5821, Portland, OR 97228. Price is $12.95.
The light is a little over 2.5 inches long, with a bright red LED beam, with a twist-on "O" ring sealed tailcap. Claimed battery life is 100 hours.