MICRO:BIT KLEF also features; an on-board amplifier circuit for extra ‘more’, an on-board speaker, and an on-board edge connector that the micro:bit slots into.
To use the Piano, the BBC micro:bit should be inserted firmly into the edge connector, either way round. If the Link Header is being used, the BBC micro:bit LED display should be facing the Piano keys.
Power is provided via a 5V micro USB connector, and the board then produces a regulated 3.3V supply which is fed into the 3V and GND connections to power the connected BBC micro:bit, removing the need to power the BBC micro:bit separately. This also powers the capacitive touch sensor IC and audio amplifier.
The BBC micro:bit is sold separately and the kit requires simple assembly, buy the microbit here.