Fuel cells create electricity from chemical reactions. A hydrogen fuel cell does this using only water, and water is the only by-product. Learn firsthand how this reaction happens, and join the chemists, physicists, and engineers who are working to create real cars that run on this technology instead of gasoline. Kit includes everything you need to build your own hydrogen fuel cell–powered car—just add water! Manual included. For ages 10 and up. Two AA batteries, not included. 8''W x 5''H x 5''D.