Pro speed: up to 130MB/s max write and 250MB/s max read with 60MB/s sustained write speeds for shooting high-resolution RAW photos, moderate burst photo sequences, and recording up to 4K video Proven: extended time tested in highest settings of high-end cameras Tough: bend/shock/X-ray resistant and IP67 dust-proof and waterproof Supportive: fully compatible with a wide variety of DSLR and mirrorless cameras Flexible: backwards compatible with previous generation of SD devices and readers.