Yeah, I should have clarified. I was talking about the kind that sits directly in front of a ground fire, and uses the heat of said fire to bake. It reflects heat from top and bottom and the biscuits or whatever are on a pan between top and bottom. It gets its cooking strength not directly from the fire, but indirectly via the shiny metal parts that reflects heat from the fire.
I think they must sort of be out of style, 'cause you don't see them for sale much. Lots of easier ways to cook in the wilds. I just thought it would be really great to have hot baked goods for supper in the woods.