With E-Blox you can build 3D circuits directly into your brick structures, so they can come to life with light, sound or motion! Compatible with other popular brick products, they offer a great addition to any STEM program. Class set features 140 pieces, including red, green, blue and color-changing LEDs. Build a heart, light tower, robot, cat and more. Plus, add these blocks to other sets to build anything you can imagine. Includes instruction manuals and online curriculum. Requires four 9 volt batteries, not included. For ages 8 and up. Ships directly from the manufacturer, please allow 1-3 weeks for delivery.