This 16 Mega-Byte FLASH Multi Media Card (MMC) is designed for use with NRG Symphonie Loggers. Non-volatile industry standard FLASH technology ensures that your valuable data cannot be accidentally erased, disrupted, or altered. Unlike volatile RAM cards, FLASH MMCs do not require a battery to retain their data, and they are not susceptible to data loss or corruption due to static discharge. A protective plastic case is provided to safely transport the MMC.