64GB 170MB/s PLUS SanDisk Extreme PRO SDXC UHS-I Card One of the best options for dependability, performance, and unwavering image and 4K UHD video quality is the SanDisk Extreme PRO SDXC UHS-I Card 128GB 170MB/s. Key Features of the SanDisk Extreme PRO 64GB 64 GB of storage Capacity Class 10 Max, V30, U3, and UHS-I Maximum Read Speed: 170 MB/s Speed of Writing: 90 MB/s Min Speed of Writing: 30 MB/s Documents 3D, 4K, and Full HD Video Integrated Write-Protect Switch Details of the SanDisk Extreme PRO 64GB Amount 64 GB of storage on one SDXC card Video Speed Class V30 Bus Type HS-I Speed Class 10 UHS Speed Class U3 Maximum Read Speed: 170 MB/s Maximum Write Speed: 90 MB/s Minimum Write Speed: 30 MB/s Sturdiness Waterproof, X-ray proof, shockproof, and resistant to extreme temperatures Temperature range for operation: -13 to 185°F/-25