IO : bit is a functionable expansion mini board for Micro: bit, which contains a miniature buzze.
It is different from the general expansion board on the market, not just IO adapter board.
1x IO expansion board (Micro:bit excluded)
Functionable IO Expansion Board Breakout Adapter Shield for KittenBot Micro:bit
-Plug and play, for Micro:bit
-With Lego mounting holes, for KittenBot
-With miniature buzzer
-Size: 3.7 x 5.7 cm
-Thickness of PCB board: 1.6mm