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 UHSI microSDXC Memory Card from SanDisk has a capacity of 1TB, is compatible with the UHSI 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. Specifications. Storage Capacity 1 TB. Maximum Read Speed 190 MB/s. Maximum Write Speed 130 MB/s. Speed Class Rating Class 3/UHSI U3. Video Speed Class V30. Application Performance Class A2. Weight 0.03 lbs