Samsung Electronics 64GB Pro microSDXC Extreme Speed (UHS-1) Class 10 Memory Card (MB-MGCGB/AM) Retail Packaging 3D and Full HD Video Recording Class 10 UHS-1 Grade 1 Up to 70MB/s read (UHS-1 Interface), Up to 20MB/s write (UHS-1 Interface) Extreme Speed with UHS-1 enabled (3x faster then typical micro-SD)