Snap Circuits Green Learn about energy sources and how to think green. Build over 125 projects using the flexibility of our award-winning Snap Circuits®. Have loads of fun learning about environmentally-friendly energy and how the electricity in your home works. Includes full-color manual with over 100 pages and separate educational manual which explains all the forms of environmentally-friendly energy including: geothermal hydrogen fuel cells wind solar tidal hydro and others. Contains over 40 parts. No batteries required! Features: Hand Crank Solar Cell FM Radio Energy Compartment Rechargeable Battery Windmill Clock Analog Meter.