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This vehicle toy flips over when it hits a wall, a first for LEGO Technic sets, to reveal the second vehicle. No wall, No issue! Children can switch cars by turning the model over. An aerodynamic tracked racer is on one side. An exploration vehicle with tracks is on the opposite side. There is a lot for kids to discover because both vehicles include suspension, a cockpit, tracks, and the exploration truck also has a truck bed. With this LEGO® Technic App-Controlled Transformation Vehicle 42140 set, kids ages nine and up can have twice as much fun. Using the CONTROL+ app to drive their car. They may control the car and accomplish entertaining challenges using the app. Each vehicle's app experience is unique and smartly shifts screens when the model flips. The car can be manually turned over or will flip over when it collides with a wall, revealing a brilliantly coloured tracked racer on one side and an orange exploration truck on the other.