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This is an expansion kit designed for, which provides 5 sets of 2x20 pinheaders, that means a handy way to stack multiple different HATs together, and use as a specific combination / project Reserved pads on the bottom side, pin are changeable by soldering, to avoid pin conflicts USB external power port, provides enough power supply for multi HATs 5 sets of 2x20 pinheaders, connect multi HATs together; Clear and descriptive pin labels for easy use Note: make sure there are no any pin conflicts between the HATs you want to use together before connecting