It starts with a module and every module works with every other in millions of combinations, you'll never run out of things to make. It all starts with Power, power is needed in every circuit and is the start of all your creations. Snap them together! Modules snap together using magnets so it's impossible to make a mistake. Add and Output: Green modules are outputs and add motion, light, sound and more to your circuits. Control with an Imput (pink): these modules send signals to your circuits in forms of buttons, dimmers, sensors, and more. Expand with a Wire: orange modules are wires that help you extend your circuit and branch out. This kit contains three littleBits sets: Smart Home Kit, Gizmos & Gadgets, and littleBits Deluxe Kit with 18 bits modules. Explore and have Fun!!