The Salt Water Fuel Cell Monster Truck Kit is equipped with four-wheel drive mechanical construction. It easily handles different types of terrain by its twisted car body design. It has two transformable engine blocks: V engine or flat engine. The transparent case design allows children to see the rhythm of the piston in vertical or horizontal position. Each monster wheel can change its angle individually and the truck can change its height and shape. Forward and reverse...no problem; simply switch the "positive and negative" connectors. The Salt Water Fuel Cell Monster Truck gives children a chance to learn about new forms of clean energy, while building and powering their very own kit: Just add saltwater. After activating the fuel cell module with a saltwater mixture, the magnesium metal sheet (3 sheets included) can operate the car for about 5-7 hours continuously. To park the vehicle, simply take out the fuel cell module and rinse with tap water and dry.