633X 256GB SDXC VER2 & VER1 = 667X VER2 & VER1 = 100MB/s Read Speed VER2 & VER1 = 90MB/s Write Speed UHS-1 Speed class 3, U3 V30 Video speed class Operating temperature range: 32 to 158F (0 to 70C) 95MB/s Read Speed 90MB/s Write Speed UHS-1 Speed class 3, U3 V30 Video speed class Operating temperature range: 32 to 158F (0 to 70C)