An electronic block kit that allows you to create 150 different circuits. - Model Name: EX-150 - Brand: Gakken - Function: Can create 150 different circuits - Included Items: Wiring set Thank you for looking. I intended to use this for my child, but I opened it and have kept it stored in a dark place since then. The only missing part appears to be the Delrin clip (for water level measurement only?). I believe a substitute could likely be found with some ingenuity. Otherwise, it's in almost new and very clean condition.