NOS- new old stock. There is some wear on box. See photos they are part of the description SNAP CIRCUITS UC-80 UPGRADE KIT CONVERTS SC500 TO SC750 Ages 8+ Includes: Solar Panel (B2) Vibration Switch (S4) Electromagnet (M3) Iron Core Rod (M3B) Bag of paper clips (M3P) Computer interface (software(Download) Computer Interface cable (CI73) 2 Spring module(PY1) CI73 Manual SC750 Manual Covering more than 250 additional projects! The UC-80 Converts Snap Circuits SC500 into Snap Circuits SC750. Includes 10 new parts including CI-73 Computer Interface, a solar panel, and more. 250 more projects/experiments.
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