It's the Circuit Playground Express Base Kit! It provides the few things you'll need to get started with the new Circuit Playground Express. This version of Circuit Playground is super powered, and will work with Microsoft MakeCode, CircuitPython, code.org CS Discoveries or Arduino IDE.
You can use Circuit Playground Express with code.org CS Discoveries, but we recommend this code.org Individual Pack which has the alligator clips and LEDs you'll need to follow all the lessons.
About Circuit Playground Express:
Because you can program the same board in 3 different ways - the Express has great value and re-usability. From beginners to experts, Circuit Playground Express has something for everyone. If you are looking for our original, Arduino-only Circuit Playground, check out the Circuit Playground Classic.
Here's some of the great goodies baked in to each Circuit Playground: