Elecfreaks Micro:bit Breakout Board (Octopus:bit) is backordered and will ship as soon as it is back in stock.
Elecfreak's micro:bit breakout board is a breakout board for micro:bit. It can lead out GPIO port, serial port, IIC port, and SPI port on the micro:bit board.
Wiki Tutorial:https://elecfreaks.com/learn-en/microbitExtensionModule/octopus_bit.html