It's a cheap plastic toy, it honestly doesn't work well at all, I'm sorry to have to say.
The "realistic" sound is inaccurate, it only makes a nosie when dragged along concrete.
I would not waste money on this lump of moulded plastic if I were you :-0
you will get more fun printing out the picture and cutting it out of cardboard than the actual toy.
Buy a JCB toy strimmer for almost the same money and it's exellent and works very very well.
I have a very happy JCB strimming two year old to verify my opinion.