Compare to other breadboard power supply designs, this one provided mini-USB port like the seeeduino , you can toggle the switch and select your power source. (USB or dc jack). We also used JST-2pin power jack ,the one as on seeeduino.
With this board, you can send power to both power lane of the breadboard, and each side has an on/off switch.
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|5V 3.3V Breadboard Power Supply||1|