Wire up circuits that glow, display patterns, and make music! Play fast-paced electronic games with lights and sounds! Learn about persistence of vision, series and parallel circuits, and how a microprocessor works! Includes: microprocessor, battery pack, 2 push buttons, 7 wires, and foldout electronics manual with instructions, explanations, and 20 activities. Tiny Circuits requires two 1.5-volt AAA (LR03) batteries, which are not included in the kit.