Snap Circuits UC-50 Electronics Exploration Upgrade Kit | SC-300 to SC-500 | Upgrade Classic to Pro Get the additional parts and manuals to take your Snap Circuit Kit to the next level UC-50 Converts your Snap Circuits SC-300 to the Snap Circuits SC-500 Includes 12 new parts including FM radio components, transistors, ICs, recorders, a meter and more 200 more projects Part of the extremely popular Snap-Circuits educational electronics series from Elenco Electronics