Snap Circuits UC-70 Upgrade Kit SC-300 to SC-750 LEVEL UP with19 EXTRA Snap Modules CIRCUITSAFE patented technology 100's MORE PROJECTS UPGRADES SC-300 to SC-750 - compatible with other Snap Circuits kits Includes 19 New Parts. Interface For Pcs. Creates An Oscilloscope Simulation On Your Window's Pc Monitor. The Cd For The Ci-73 Is No Longer Included. Please Check The Manual For The Steps To Download The Software