SD card breakout module is a simple module that facilitates connections between SD memory card and the microprocessor systems. If you are working with some sort of data logging, graphics or audio, you will need at least a Megabyte of storage. In order to get that kind of storage, you need flash card, SD or micro SD card. You can store data logging files on this SD card breakout module and access the files using the built-in card reader on your computer or using an external card reader. This breakout board has been tested with Arduino and it works perfectly well.