This is a "basic" use (extension of the memory of my smartphone) which led me to purchase this micro-SD card and SD adapter provided. It has never been so far faulted and works perfectly. Class 6 is more than enough for use on mobile until "mid-range" not requiring responsiveness to nanosecond. For use on a "current" camera, I urge people to turn to the 10 most likely classes to meet their expectations.