Designed for SD devices that can capture , the 256GB Professional 633x UHS-I SDHC Memory Card has a capacity of 256GB, which will allow you to shoot for extended periods of time while changing cards less frequently. It is compatible with the UHS-I bus and features a speed class rating of U1, which guarantees minimum write speeds of 10 MB/s. Read speeds are supported up to 95 MB/s and write speeds max out at 45 MB/s. This card can also withstand temperature extremes from -13 to 185°F, and a built-in write protect switch further helps to safeguard your content.