The USB Reg Board is a smart accessory board, which lets you power their electronic devices by connecting them to the USB port of their personal computer. This plug-and-play additional board just needs to be plugged into a USB hub so that the device can get powered over the USB connection. The USB regulator board has been designed to provide both 3.3V and 5V DC outputs. While 5V output comes directly from the USB, and incorporated MC33269DT power regulator circuit enables the board to produce 3.3V reference also. So, what this compact-sized board actually does is that it allows you to conveniently power any of your 3.3V or 5V prototype device directly from the USB port of your PC in a very simple and cost-efficient manner.
This USB Reg Board comes equipped with three solder pads that enable it to get connected to 3.3V, 5V and GND outputs. After getting a header soldered into the regulator board, this board becomes compatible for use with breadboards too.