This is a plug-in power supply, and the headers below the board simply plug-in to the breadboard.
Once plugged in, the voltage rails to both sides on the breadboard then provide power.
This is a dual output, there are two regulators where one regulator establishes a 3.3-V rail, whilst another establishes the 5-V rail
You then use the yellow jumpers to select the voltage levels required.
- Locking ON / OFF Switch
- LED Power Indicator
- Input Voltage: 6.5 V to 12 V (DC)
- Output Voltage: 3.3 V / 5 V
- Maximum Output Current: 700 mA
The Breadboard Power Supply Module is a power module for the standard bread board.
for more information visit the link below https://www.petervis.com/Raspberry_PI/Breadboard_Power_Supply/YwRobot_Breadboard_Power_Supply.html