Snap Circuits make learning electronics a snap. Contains over 60 parts. Just follow the colorful pictures in our manual and build over 300 projects, such as AM radios, burglar alarms, flash lights, 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. No tools required. Uses AA batteries - not included. Computer Interface SC-300S expands the SC-300 by turning your PC into an oscilloscope and spectrum analyzer; 21 additional experiments; serial cable (included) attaches to the microphone input of your PC (not Mac-compatible). WARNING: CHOKING HAZARD - Small parts. Not for children under 3 yrs.