THK-620384 Robotics Smart Machines Super Sphere Engineering STEM Experiment Kit (D)Build an awesome, nine inch diameter, rolling robotic sphere and six other robot models. Drive your robots using the remote control interface in the included app, which you can install on your tablet or smartphone. Or write programs for your robots using an easy, visual programming language in the app. The onboard sound sensor lets you program your robots to perform specific sequences of commands in response to the number of claps (or other very loud