... function Virtual Wall Robot Vacuum Cleaner with auto charging function, works on carpet, tile,hardwood etc MAIN FUNCTIONSSpecification :Materials: PS(PC ... of charge).17.Fragrance(optional smell, not free of charge) works on carpet,hardwood,linoleum & tile.Easily slide out the bag ... ,black,purple,blue Robot Vacuum Cleaner with auto charging function, works on carpet, tile,hardwood etc