This set provides four Circuit Blox 395 kits (CB-0170), all packed into a sturdy storage case for sharing in the classroom. Each kit provides hours of fun and educational play. The colorful building blocks contain electronic components such as a battery module, switches, LEDs, resistors, photo-resistor, capacitors, transistor, motor, speaker, IC sound module, amplifier or FM receiver. Each kit builds 395 different 3D circuits that teach STEM and light a star, spin a motor to launch a fan high in the air, play music, sirens and space battle sounds, and even build your own FM radio and alarm clock!