The Base Shield V2 is an expansion board that has many Grove connectors. You can conveniently use Grove products in conjunction with it. It is also compatible with a series of Arduino products.
Power Compatible: Every Grove connector has four wires, one of which is Vcc. However, not every micro-controller main board needs a supply voltage of 5V, some need 3.3V. That's why we add a power switch to Base Shield v2. In this way, you can adjust the voltage of Vcc via this switch, making sure the voltage of Vcc is the same as supply power of the main board.