This model was built during the month of april. It’s not very complex but all the functions are playable. So, it owns two M motors located on the turret which control tracks ( each motor drive a track). The rotation, controlled by a M, is infinite. A XL power the main arm. The two others functions of the arm are controlled by two M, located on the arm. I have also built a controller which permit to enhance the playability of the excavator. As you can see, i’ have never played a lot with this model and i dont’ operate it well.