Samsung 64GB PRO Class 10 Micro SDXC UHS-1 Read 90MB/s, Write 80MB/s with Adapter, MB-MG64EA/BBY Up to 90MB/s Read and 80MB/s Write speed with Class 10 and U3 compatibility Great Performance in Action Cameras, DSLRs, High-End Smartphones and Tablet PCs Ideal for 4K content, Full HD Video recording and high resolution pictures Rugged, Reliable, Built to Last: Water, X-Ray, Temperature and Magnetic proof