SanDisk 4GB Memory Stick Micro (M2) (SDMSM2-004G, BULK) Read/write: 10MB/sec read, 3MB/sec write 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 SDMSM2-4096/004G bulk