How does a fuel cell work and how does it generate hydrogen? This 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 (sold separately). Includes reversible fuel cell with integrated hydrogen storage unit, solar module (1V, approx. 400 mA) and instructional activity booklet. Requires Eco Energy.