Children can learn about the science of electricity as they create their own working circuits. Snap circuits snap together easily - no tools required. Comes with more than 30 parts, and you can build more than 130 different projects. Parts include a glow-in-the-dark flying saucer, color-changing LED, phototransistor, motor and more. For ages 8 and up. Requires 2 AA batteries, sold separately.