This set provides four Power Blox Builds Plus kits (PB-0040), all packed into a sturdy storage case for sharing in the classroom. Contains 292 parts. Requires four 9V batteries. Each kit provides a unique, patented technology that enables you to build 3D circuits into your structures without any wires. The tin plated parts in this set are conductive so they can be used to create 3D circuit paths from the battery module to the LED modules provided in this set to integrate lights into you structures. Online instructions show you how to build a cat whose eyes light up red, blue or green and can even flash on and off.