Designed for microSD devices such as smartphones, drones, and action cameras that can capture Full HD and 4K video, as well as raw and burst photography, the 1TB Extreme UHS-I microSDXC Memory Card from SanDisk has a capacity of 1TB, is compatible with the UHS-I bus, and features a speed class rating of V30, If your device does not support the V30 standard, this card also supports the U3 standard, Read speeds are supported up to 190 MB/s and write speeds max out at 130 MB/s. SpecificationsStorage Capacity: 1 TBMaximum Read Speed: 190 MB/sMaximum Write Speed: 130 MB/sSpeed Class Rating: Class 3/UHS-I U3 Video Speed: Class V30Application Performance: Class A2Weight: 0.03 lbs.