Supports 2 / Micro SDHC cards and 2 Micro SD (HC) cards of different capacity can be used. Card types can be mixed cards of different capacity and different type can be used concurrently (i.e. Micro SD+ Micro SDHC). The adapter works with only one micro SDHC card as well. The second slot can be equipped anytime.CR-5400 is made of high quality components and preserves the original speed of the inserted (when two different types of Micro SD(HC) cards are used the slower card sets the speed rate) - Supports SDHC - Ultra light weight - High speed and energy efficient circuitry design - TF card fits flush inside the PRO duo adapter - Completely identical to regular MS PRO Duo memory cards in size - Converts cheap and commonly available MicroSD/Transflash memory cards for use on Memory Stick PRO Duo devices (PSP digital camera MP3 players etc) - Works with Sony Playstation Portable PSP game consoles (PSP 1000/2000/3000)