Card Type SDXC Storage Capacity 256 GB Speed Class 10 UHS Speed Class U3 Bus Interface Speed UHS Class I Data Transfer Read Speed 95 MB/s Maximum Durability Magnet-Proof Shockproof Temperature Extremes Waterproof Operating Temperature -13 to 185F/ -25 to 85C Built-in Write-Protect Switch YES Item Dimension (LxWxH) : 5.