The photo shows a 'YuRobot' board (I've no connection with the company) I picked off ebay recently for a couple of quid (that's 'bucks' to my US readers).
It has pins on the underside which plug into a prototyping breadboard, creating two sets of breadboard power rails. The little yellow jumpers allow you select 3.3V or 5V outputs.
You supply power to the YuRobot through a 9V supply (the datasheet for the voltage regulators say they have a 15V absolute max.) or from your PC's USB port (you'll need a male-to-male USB cable).
The board features a couple of AMS1117 voltage regulators in SOT-223 packages. The AMS1117 datasheet says these are rated to 1A, with an output voltage accurate to 1.5%. My voltmeter measured 3.296V and 5.015V - pretty good for the price.
Overall, a handy little widget I can recommend.
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