This is a lot of 24 Elenco Electronic Snap Circuits Replacement Parts.  These are not necessarily from one particular set, but may come from various sets.  Includes all seen in the photos including one battery power pack (no batteries included).  R3, S1, C1, CV, U4, U5, Q1, etc.  In nice used condition with possible minor signs of wear.  Great for STEAM or STEM activities - teaching kids about electrical wiring.  Shipped with USPS mail.