How does a fuel cell work and how does it generate hydrogen? The Fuel Cell Kit brings this technology of the future directly into the child?s play room and provides answers to these and other questions! With the fuel cell and the additional solar module, interesting additional models can be built in connection with the ?Oeco Energy? construction set. The instructional activity booklet offers assistance. (CAUTION: Absolutely necessary for operation is Oeco Energy – Art.-No.: 520400 or Oeco Tech ? Art.-No.: 505284).