They are battery powered (they take 2 C batteries) and they last for 350 hours. This means they will last the entire camping season for me. They have a flicker mechanism and are made of real wax. They are brilliant! I've had people try to blow them out, they are that convincing.
I bought 2, 6" candles for the pavilion last year and they were the best purchase I made. I bought 2 more and I'm going to ensconce them in my brass lanterns that have the horn panes. After spending a good hour plus digging wax out of the bottom after Lilies, I'm kind of done with that nonsense.