JJC BC Series Multi-Function Battery Case is not only a battery case but also a memory card case.
Capacity: 64GB. Read speed: 170MB/s. Write speed: 80MB/s. Extreme series
Capacity: 64GB. Read speed: 200MB/s. Write speed: 90MB/s. Extreme PRO series
Capacity: 1TB. Read speed: 200MB/s. Write speed: 140MB/s. Extreme PRO series