This kit provides a unique, patented technology that enables you to build 3D circuits into your structures without any wires! The tin plated parts are conductive so they can be used to create 3D circuit paths from the battery module to the LED modules provided in this set. Online instructions show you how to build a robot whose eyes light up red, blue or green! A storage case is included to store parts.Details:45 piecesRequires a 9V battery (sold separately)Directly compatible with other brick building construction setsFor ages 8 and upContents:45 colorful building piecesLEDsOnline instructionsStorage case