These are a USB MicroSD card reader and are used with MicroSD memory cards to allow you to copy files onto them with your PC or Mac, note that all of our DS & DSi flash cards come with these, but some people lose them or break them and they are not easy to find in stores, so we have listed them as a separate product for those people. If you need a USB MicroSD card reader for your MicroSD memory cards, these are what you want. These readers support both MicroSD & MicroSDHC cards, so you can use them from sizes as small as 1GB MicroSD cards to the massive 16GB MicroSDHC cards. Buy USB MicroSD card readers here!
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