Dickie Toys Air Pump Action Excavator Vehicle, 21" With the Air Pump Excavator, Dickie Toys has scaled the insatiable earth eater down into a toy version with lots of features The big bucket goes up and down by pneumatic action by pushing a knob or operating a lever Without any batteries at all, but by means of a technical principle that is an instant source of fascination to children The child gains his or her first experience of physics and pneumatic pressure through play while training motor skills To make the building site experience even more realistic, the digger comes with building site signs and barriers