UGEAR's Tractor model has rubber band engine. Set the lever at "Park" and wid up rubber band by rotating rear wheel. After winding, set the lever to "Drive" mode to start the tractor!
WARNING: Don't wind the rubber band over 4 times, or the pulley shaft which supports the rubber band may break off. Replacing to a stronger shaft material, such as bamboo, is recommended, if possible.

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