1. Holds 2 cards for super large capacityGet maximum storage capacity with 2 microSDHC or 2 microSD cards. CR-5400 converts 2 microSD(HC) cards into one MS Pro Duo stick. <br />You can get twice the capacity at a lower price.<br />2. Card types can be mixedCards of different capacity and different type can be used concurrently (i.e. microSD+microSDHC).<br />3. Freedom of expansion and upgradeThe adapter works with only one microSDHC card as well. The second slot can be equipped anytime later. You can exchange the cards and upgrade the max. capacity at will!<br />4. Super high read/write speeds of 10MB/s and upCR-5400 is made of high quality components and preserves the original speed of the inserted microsd(HC) cards(when two different types of microSD(HC) cards are used・ the slower card sets the speed rate)<br />Supports 2 microSD/microSDHC cards.2 microSD(HC) cards of different capacity can be used.If only 1 microSD(HC) cards is used・ it must be inserted into slot#1 in order to workWhen using new microSD(HC) cads・ you need to format with a for SONY product before you can store data.In order to copy or delete data directly・ insert CR-5400 in your card reader. Don't take out the microSD(HC) cards and perform write operations on the single card. Your data will be corrupt.<br />Note 1: Data Transfer can only be done with micro SDHC cards inserted in CR-5400. Direct PC to micro SDHC card data transfer and then inserting in CR-5400 won't work.<br />Note 2: Re-using your m