1. Holds 2 cards for super large capacity
  Get maximum storage capacity with 2 microSDHC or 2 microSD cards.CR-5400 converts 2 
  microSD(HC) cards into one MS Pro Duo stick. You can get twice the capacity at a lower price.
2. Card types can be mixed
  Cards of different capacity and different type can be used concurrently (i.e. microSD+microSDHC).
3. Freedom of expansion and upgrade
  The 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!
4. Super high read/write speeds of 10MB/s and up
  CR-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)

Product description:
● Supports 2 microSD/microSDHC cards.
● 2 microSD(HC) cards of different capacity can be used.
● If only 1 microSD(HC) card is used, it must be inserted into slot #1 in order to work
● When using new microSD(HC) cards, you need to format with a 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.