DC Breadboard Power Supply Breakout w/USB

Very usefull product for that price. As said in the description, it is perfectly suited for use with the dedicated breadboard. You’ll have to force a bit to let it in the first time, but it works perfectly afterwards. It allows to provide 3.3V and 5V at the same time (using easy jumpers), which is very convenient. Beware of the connectors for input power: either DC Jack or Male-A USB.