2gb 650 4gb 800 only for serious buyers 980-3434272 viber whatapp Sony 4GB Memory Stick PRO Duo Mark2 flash memory card, which is primarily used for storing data in compatible devices like Sony cameras, camcorders, and PlayStation Portable (PSP) consoles. Capacity: 4 GB, with approximately 3.66 GB of usable storage space. Technology: Features MagicGate copyright protection technology and a high-speed Mark2 rating for HD video recording. Speed: Offers minimum write speeds of 15 Mbps on op