It is perfectly used for PSP (support MagicGate) , Sony Cameras and other devices that support Memory Stick Card.
http://i856.photobucket.com/albums/ab125/deals2buy/Sandisk_Pro_Duo_Card/SanDisk_4GB_memorystickproduo.jpg
SanDisks Memory Stick PRO Duo is half the size of a standard-size Memory Stick PRO media and it offers the same technologies, including high speed data transfer and high capacities. Embedded MagicGate technology ensures safe transfer of copyright-protected content. The Memory Stick PRO Duo is the ideal solution for the most portable devices such as pocket-size digital cameras.
Features
Larger storage capacities than standard Memory Stick cards
Exceeds minimum Memory Stick PRO specifications
Advanced security with Access Control Function and MagicGateβ’ technology
Compatible with all Memory Stick PRO-compatible devices
5-year limited warranty
