R4 card is a good adapter which is user friendly and also enhances your games. This R4 is one little device which is a must for the Nintendo device owners. It allows you to watch movies, listen to music; Mp3?s or even read the e-book. It has the drag and drop facility which make the movement of the files onto the R4 card or adaptor via your pc. The files are stored on the microSD memory card which is inserted inside the R4 card. In the market, you?ll find each package containing 1xR4 Card, 1 x MicroSD card reader and 1 x protective card case. Important information you need to know is that to use the R4 version 2, you will need to have a microSD or the microSDHC card. It is advisable to get the highest capacity MicroSD card available to see the best results from your R4 cards. If you usage is more than 2GB, you can probably choose the R4 card version 3 adaptor. The version 3 of R4 card has 4GB memory and allows you delete or add files for further usage. There are some online shops which will give you a trial period for the R4 cards, but the rest will give you the refund only if the product is found to be faulty. A R4 expert will look into the matter and decide accordingly. Also, you need to have the knowledge regarding the downloading of the files or memory information. You can even take assistance from the store you buy or from the online shopping stores which can guide you and provide you with some basic instructions and information of the product with the help of the user guide manual or call assistance.