Sandisk 4GB M2 Memory Stick Micro (SDMSM2-4096-E11M, Retail Package) Includes Memory Stick PRO Duo adapter for universal compatibility with M2 slots and Memory Stick PRO Duo slots Dual voltage operation; 1.8v for new Sony Ericsson mobile phones, 3.3v for Memory Stick PRO Duo compatible devices Controlled ejection design allows for easier removal Sony Magicgate encryption technology support Capacity: 4GB Read/write: 10MB/sec read, 3MB/sec write