M5 Stack
M5 Stack is a comprehensive name, which brings out its unique qualities
Modular
Modular = Core + Module + Unit + Accessory
5 cm X 5 cm
Small, only 5 cm x 5 cm, easy to carry. More convenient for wearable device products.
Stackable
Easy to expand, just stacking Core and Modules together. Eliminate the troubles such as welding.