SanDisk flash memory card - 512 MB - RS-MMC (SDMRJ-512-A10M, Retail Package) Slot compatibility - RS-MMC, MMC when used with an extender SanDisk RS-MMC does not support low voltage phones like the Nokia 6630, 6680, 6681, 6682 Dimensions - 0.7087 x 0.9449 x 0.0551 inches