THK-620380 Robotics Smart Machines Rovers & Vehicles STEM Engineering Kit (D)A follow up to the best selling original Robotics: Smart Machines kit, this version focuses on wheeled robots. Like the original, this kit also gives kids a simple, fun, and customizable introduction to robotics that lets them build eight motorized machines controlled by programs and an ultrasound sensor. Kids code the programs using an easy, visual programming app on a tablet or smartphone, which connects to the robot models via a wireless Bluetooth