With this building toy, young engineers can assemble over 100 different electronic circuit projects with just 30+ electronic parts. Kids can construct working models of a photo sensor, a flashing light, an Adjustable-Volume siren and much more! This stem kit comes with a clear, easy to understand illustrated instruction manual No tools needed! All parts Just click together and support a vigorous STEM/ steam educational curriculum. Learn by doing. Designed for young engineers 8+.