The new INVENTOR MECHANICS series has a thematic approach with multi model capabilities, featuring an impressive main model of a 4 wheeled extreme bike and further options of building another 9 models (10 models in total). A new library of patent-pending components has been added to the ENGINO system which enhances both aesthetics and technical features. Full printed instructions are included and there is also a free app to download with instructions and more. These parts include high-precession wheels, mechanisms and snap-fit curved surfaces. The smaller sets in the series are suitable for 9 year olds, while older children are challenged with the bigger sets which also include a forward and reverse geared motor. The top of range steps-up the complexity with Robotics technology, Bluetooth connectivity and software control. Requires 3 x AAA batteries, not supplied. Suits ages 9 years +. Features: The new INVENTOR MECHANICS series has a thematic approach with multi model capabilities It