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Hours of building fun, but with lights! The colorful LED blocks emit colorful light, while the colorful transparent spacers allow light to pass through them, creating a stunning light display and bringing your creation to life! Circuit Blox snap onto your existing building bricks to create endless possibilities while learning about electric circuits, switches, current and more. Set includes Audio Controller Module, Touch Controller Module, USB Power Adapter Block, 24 LED's, 108 Transparent Light Refracting Blocks. All parts are compatible with Lego, Duplo and other popular building blocks to add even more fun to your building experience and add life and LED light to your old sets! Requires 3AA Batteries not included.