Good for elementary students. No soldering required. Snap Circuits Motion Detector - Walk in front to trigger laser sounds and a red light. Assembling working circuits is a snap with our durable components. The molded plastic base is specially designed for arranging circuits, electronic components and connectors, which are color-coded by function and snap into place. The final circuit resembles the typical circuit diagram to eliminate confusion. Needs one 9V battery, not included
