Scarification is the remover of grass after lawn mowing so that you can improve the efficiency of the fertilizers it makes room for the healthy grass to grow the lawnmower comes with tow breads as indicated there in the photos above one for the tough lawn and one for final cleaning wich is optional the machine can easily be adjusted at the level you want the machine is easy to oparet and uses the normal electricity and the gas over 1800W comes with a user manual guide comes complet ready to oparet and can easily be serviced