Keyestudio 4WD Manual page 112

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(4)Test Results:
After uploading test code 1 to micro:bit main board V2 and powering the
main board via the USB cable, the 5*5 LED dot matrix shows A if button A is
pressed, B if button B pressed, and AB if button A and B pressed together.
After uploading test code 2 to micro:bit main board V2 and powering the
main board via the USB cable, when pressing the button A the LEDs turning
red increase by 5 while when pressing the button B the LEDs turning red
reduce.
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