This is a very simple board that takes a 6-12V input voltage and outputs a selectable 5V or 3.3V regulated voltage. All headers are 0.1" pitch for simple insertion into a breadboard. Input power can be supplied to either the DC barrel jack or the two pin header labeled + and -. Output power is supplied to the pins labeled GND and VCC. Board has both an On/Off switch and a voltage select switch (3.3V/5V). The two sets of four GND and VCC holes are spaced such that when connected to our Basic Breadboard both power busses will be powered. https://elecena.pl/product/22146693/sparkfun-breadboard-power-supply-stick-5v-3-3v-with-headers 2022-12-01 https://elecena.pl/product/22146693/sparkfun-breadboard-power-supply-stick-5v-3-3v-with-headers 2025-04-11 https://elecena.pl/product/22146693/sparkfun-breadboard-power-supply-stick-5v-3-3v-with-headers 2025-04-14 https://elecena.pl/product/22146693/sparkfun-breadboard-power-supply-stick-5v-3-3v-with-headers 2025-05-02