This is a connector that fits directly to the edge contacts of a BBC micro:bit. The connector has 80 pins, but because of the different widths of the micro:bit edge contacts, some of the micro:bit contacts will map to more than one of this connector's pins. Also, the back half of the pins are not used at all. https://elecena.pl/product/17501492/2x40-right-angle-edge-connector-for-micro-bit 2021-04-07 https://elecena.pl/product/17501492/2x40-right-angle-edge-connector-for-micro-bit 2021-09-04