The R4 card is the most popular flash card on the market, designed by the original R4 team the R4 card provides the latest in flash card technology combined with extremely high reliability and support for the latest firmware updates. The R4 card was originally designed for the DS and DS lite consoles which were the first of Nintendo’s hugely popular modern day mobile gaming devices. Since then there have been many new devices coming on the market including the DSi, DSi XL and 3DS consoles, which have been supported by newer R4i SDHC and R4 3DS cards, these cards work with the latest firmware for the consoles and allow you to add either a Micro SD or SDHC memory card to your console (which supports up to 32GB of data). The R4 works by simply allowing you to add either a Micro SD or SDHC memory card to your console and then you are easily able to transfer over any files you wish to playback on the go.