Boson Inventor Kit for BBC micro:bit and Arduino

The DFRobot boson kit is a set of coding-free electronic building block for young inventor, STEM educator and tinkerers. The kit break down complicated circuit into simple, functional module that are easy to understand. The kit requires no coding or soldering and is ideal as a STEM classroom teaching tool.

Its dimension is 22x34 mm & 34x48 mm
I used 3xAAA battery holder