Build a Formula E racing icon – Motorsport fans will love building this LEGO Technic Formula E Porsche 99X Electric (42137) set 
Augmented reality – Download the LEGO Technic AR app to scan the model. Then use the pull-back function to launch the car using your foot and see it come to life in exciting races 
Pull-back function – Using the 2 pull-back motors, kids can judge how much energy to put into the car toy before making the perfect start to the race using the trigger 
A coolway to play – The pull-back function combines with the LEGO Technic AR app. After scanning the car in the app, pull it back by hand then use your foot to launch the car and watch the result 
Authentic design – This buildable model Porsche is an authentic model replica of the real-life Formula E Porsche race car, complete with sponsor logos