The Pi Supply micro:bit breakout board is an add-on board which is designed for the BBC micro:bit board. It has 3.3V of input voltage and is powered by the edge connector of micro:bit.
Input voltage: 3.3V, Powered by the edge connector of micro:bit: Extend all of GPIO ports (P0∼P16, P19∼P20). Beneath each I/O port, there are pins for VCC and GND. These pins are differentiated by colours, which enable you to connect extension modules. The spread of pins is fully compatible with Octopus series of products