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Thames and Kosmos | Robotics Smart Machines: Tracks and Treads | for Kids 8+ | STEM Kit Builds 8 Robots | Color Manual to Help with Assembly | Requires Tablet or Smartphone | Parents' Choice Silver Award Coffee Grinders rose and oriental lily toThe latest installment in the award winning robotics: smart machines line, this version focuses on motorized machines that make use of continuous tracks, also known as tank treads, to move themselves and other objects around. Models are controlled by programs and an ultrasound sensor, so in addition to constructing the machines, you'll also learn how to use the included visual programming app on your tablet or smartphone to code the programs yourself!