The colorful building blocks have electronic components in them that, when assembled properly, will make circuits that light different lights, create entertaining sounds, and spin a motor and fan. You can even build and electromagnetic inductive windmill that spins continuously! There are 800 different projects to build! Includes: various switches, 4 lamps, 4 heart LEDs, 4 star LEDs, 4 speakers, 4 audio blocks, 4 buzzers, 4 inductors, 4 windmills, 4 motors, 4 resistors, 4 photoresistors, variable resistors, 4 capacitors, 4 transistors, and more Includes building manuals and reusable storage case.