SCT 128GB x2 = 256GB SD XC Class 10 UHS-1 Secure Digital Ultimate Extreme Speed SDXC Flash Memory Card 256G 256 GB GIGS (S.F128.RTx2.550) with SoCal Trade SCT Dual Slot Memory Card Reader - Retail Packaging 2 PACK 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