RS-MMC is designed for use in the newest generation of ultra-small mobile phones. It is about half the size of a standard MultiMediaCard(MMC), and has the same simple, low power interface. This allows the RS-MMC to be used with an extender in a full size MMC slot.

The Reduced Size MultimediaCard (RS-MMC) is a small, removable, portable flash memory card used in mobile phones for the storage of images, video and music, content.