SanDisk Extreme PLUS SDHC UHS-1 Card 16GB ( HD Standard Quality ) Speed up to 90 MB/s* 600X : If these elements appear to be the card you own ? Then you also glean the benefit of UHS speed Class 3 (U3) Full HD video enabled by Speed Class 10. This particular SanDisk supports 4K ULTRA HD VIDEO enabled by UHS Speed Class 3 (U3).