Secure Digital card is the latest storage technology for digital devices such as Digital Cameras, MP3 players, PDA’s, Digital Voice Recorders and Cellular Phones. About the size of a postage stamp these tiny storage cards are reliable and durable.Mobile Storage Secure Digital Card can be written to, erased and reused thousands of times with out loss of quality and are 100% compatible with all digital devices with a Secure Digital (SD) or most MultiMediaCard (MMC) slots.