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The Dementor is controlled by someone at the base. You can see what is going on by the camera on top of it. It has a shovel that picks up dirt and other things. The storage compartment holds all the dirt and can later be opened at the base. It has solar panels that collect energy from the Sun and has an extra battery pack in case there's no sun. The wheels have spikes on them to loosen up the dirt. There is a light to see what is going on if it is dark where the Dementor is. It is controlled by a controller and a screen at the base.