Three ready-to-hang light balls. Plug each of the three completed holiday light balls into the three prongs of the indoor extension cords. Plug each of the three indoor extension cords into the three prongs on the heavy-duty extension cord.
We recommend three lighted balls per tree at least six feet apart for maximum effect. Plug the heavy-duty extension cord into an outlet which is the shortest distance between your house and the tree you wish to decorate.