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. The power blox starter set features 25 pieces, including red, green and blue LEDs. Build a heart, light tower and simple robot. Plus, add these blocks to other sets to build anything you can imagine. Requires one 9 volt battery, not included. For ages 8 and up.