This building kit from the professional series is occupied with the subject of "Regenerative Power". The production, storage and use of energy from the natural energy carriers: water, wind and sun are explained very clearly through 8 models and numerous experiences. The solar motor, two solar cells, the time-tested Gold Cap as energy store, light diodes and more than 150 parts. With detailed building instructions and accompanying booklet on "Regenerative energies" for hobby and school use. #57485.