Glows for 1 year with standard battery ( up to 2 years with duracell ultra), 8o hours mid beam, 20 hour high beam, 80 hour strobe light. Waterproof, highly visible for up to 2 miles. Runs on 9V battery. I have used this flashlight for ten years now and have had no problems with it. It has an extremely bright light, rugged, and you can find it in the dark. Call Glenn at 630-989-1964 for more information.