This floor sander is meant for sanding wood floors which are in good condition but need the top surface sanded down to be refinished. This sander can be used on either indoor or outdoor floors, but if being used outdoors make sure all screws or nails are driven below the surface of the wood. The sander weighs 140 pounds and requires two people to load/unload. We also carry sandpaper for this sander which is sold separately. This item requires the end-user to come in for full training on this unit and a standard 110v power supply.