The Circuits Block Set Is A Great Start For Introducing Kids Ages 7-12 To Basic Electronics, Cool Science Experiments And Electrical Circuits. It Uses Real Circuits And Modules To Create A Fun, Playful Learning Experience And Comes With Many Challenges Of Increasing Difficulty, Allowing Children To Learn About Circuits While Playing Easily. Kids Circuits Requires 3 Aa Batteries (Not Included) The Circuit Board For Kids Has 20 Components Including Switches,Rgb Lights, Power Supply, Push Switch, Potentiometer, Flying Saucers And Fans, 8 Wires As Well As Other Parts And Accessories Needed To Create More Than 64 Different Stem Projects That Snap Together Easily On The Included The Pellet Board, And No Extra Tools Needed