These Snap Circuits make learning electronics easy and fun! Just follow the colorful pictures in the included manual and build exciting projects, including FM and AM radios, digital voice recorders, 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 4 AA batteries. The Snap Circuits Extreme model contains over 80 parts to build over 750 experiments. Includes everything from SC-500 plus experiments in solar, electromagnetism, vibration switches, and 70 computer interfaced experiments. Easy-to-follow illustrated instructions are included.