Begun in 2004, finished (or abandoned August 2015). I can't get this to go back at all. It will move into the future but at a very slow pace. Theoretically, the RRRegret 5000 would allow 4 persons to time travel at will as long as they hold on to one of the upper prongs. Free shipping in the continental U.S.A. . If outside the U.S.A. then shipping costs will be added.