Snap Circuits make learning electronics easy and fun! Just follow the colorful pictures in our manual and build exciting projects such as AM radios, burglar alarms, doorbells and much more! You can even play electronic games with your friends. All parts are mounted on plastic modules and snap together with ease. Enjoy hours of educational fun while learning about electronics. No tools required. Uses "AA" batteries. Snap Circuits, Jr. - Contains over 30 parts. Build over 100 exciting projects.