Secure - built-in write-protect switch prevents accidental data loss | 2-Pack High Quality SDXC cards backed by 1 year limited warranty | Ultra High Speed UHS-1 Class 10 / File Format - FAT32 (SDHC 4GB-32GB) ExFAT (SDXC 64GB-128GB) | SoCal Trade SCT MicroSDHC XC & SDHC SDXC Dual Slot Memory Card Reader included | Compatible - with SDXC host devices, SDXC cards are not compatible with standard SD nor SDHC-enabled devices/readers