The Techno Gears Sets Are The Perfect Way To Encourage Youngsters To Build. With 80+ Colorful Construction Pieces Like Translucent Colored Plastic And Flashy Chrome Parts, Rotating Gears, And Moving Propeller, The Kit Includes Everything Your Airplane Enthusiast Needs To Build Their Own Moving And Working Bionic Biplane. The Mechanics Of These Techno Gear Sets Include Gears And Will Introduce And Allow Them To Experience The Science Of Gear Ratio. These Products Align With And Support Stem (Science, Technology, Engineering, And Math) Standards. Requires Two Aa Batteries (Not Included) And Six Button Cell Batteries (Included). Ages 6+ Years.