Robotics is a vast and thrilling interdisciplinary field involving physics, engineering and computer science. This kit gives kids a straightforward introduction to robotics that lets them build motorized machines controlled by computer 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 connection. A full-color, 64-page step-by-step illustrated manual helps kids assemble a humanoid robot that walks forward on two legs and pivots to avoid obstacles in its path, a funny crocodile that wags its tail if no object is in sight but opens its giant jaws when an object approaches and many other fun models. Includes 230 building pieces. Requires a tablet or smartphone running iOS (iPhone 4S or later, iPad 3 or later, iPod 5 or later) or Android (Android 4.3 or later on a device with Bluetooth 4.0 support).