SDHC cards are similar shape and size to standard SD cards, but will only work in SDHC compatible devices. SDHC cards fall into 1 of 3 categories, Class 2, Class 4 and Class 6. The Class of the card determines the minimum sustained write speed to the card in megabytes, Class 6 = 6MB/sec, Class 4 = 4MB/sec and finally Class 2 = 2MB/sec. Primarily designed for movie recording, it is important to know the minimum sustained write speed rather than the maximum speed which is normally quoted on the other cards. All our SDHC cards are manufactured to our traditional high standards to ensure maximum reliability and peace of mind you have come to associate with Fujifilm. Please check your device is compatible with SDHC cards before purchase.