Compliant ? with the SD Specification Version 2.00 (Class 4) and with the SD Specification Version 3.00 (Class 10) * Versatile ? when combined with the adapter, can be used as a full-size SDHC card * Compatible ? with microSDHC host devices; not compatible with standard microSD-enabled device/readers * File Format ? FAT 32 * Reliable ? lifetime warranty * High-Speed Class Rating ? Class 4: 4MB/sec. minimum data transfer rate