Take STEM learning to the next level by adding the spirit of competition to the equation. Each STEM Plus Interface allows up to 4 alternating power sources to be compared at one time. Using a computer, students can see real-time data comparison or RPMs and power output of their alternators. Students can compete with each other to see who can build the most efficient wind turbine. With the option to construct both Horizontal and Vertical Wind Turbines, students can experience two different types of AC wind turbines.This kit contains all parts needed to construct four wind turbines, and a STEM Plus Playoff Interface board.