Snap Circuits UC-40 Electronics Exploration Upgrade Kit | SC-100 to SC-500 | Upgrade Junior to Pro Get the additional parts and manuals to take your Snap Circuit Kit to the next level UC-40 Converts your Snap Circuits SC-100 to the Snap Circuits SC-500 Includes 42 new parts including AM radio components, transistors, ICs, capacitors, resistors, recorders, a meter and more 400 more projects Part of the extremely popular Snap-Circuits educational electronics series from Elenco Electronics