Let your child unleash creativity and imagination with the Engino Inventor Motorized 4 Wheeled Extreme Bike with 10 Bonus Models. The Inventor Mechanics series has a thematic approach with multi-model capabilities, featuring an impressive main model of a four wheeled extreme bike and the further options of building another nine models. The creative snap-fit system allows you to build many different models with ease. A library of patent-pending components has been added to the Engino system, which enhances both aesthetics and technical features. The parts include high-precession wheels, mechanisms and snap-fit curved surfaces. Full printed instructions are included. There is also a free app to download with instructions and more. It requires 3 x AAA batteries (not supplied). Suitable to ages nine years and above.