Snap Circuits 300-in-1 makes 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. Includes Projects 1-305 manuals. (includes all of the SC-100 projects and 200 new ones).Features: Same as SC-300 plus 41 computer interfaced projects. The software in this product is not Mac-compatible but you can find a similar Mac version at http://www.physics2000.com/Pages/MacScope.html. It will not match our manual exactly but the differences are minor and it should be easy to understand. The software at this link is not related to Elenco® Electronics Inc. in any way; we do not support it or accept any responsibility for it.