The Video Speed Class includes the speed level V30, the number indicates the minimum write rate in megabytes per second (MB/s). By combining a device with a Video Speed Class label and an SD memory card with the same Video Speed Class label, you can capture memories in the best quality. The V30 reliably captures Full HD and 4K resolution.
UHS-I-capable SD cards enable theoretical data transfer speeds of up to 104 MB/s. Speed class U3 is for 4K videos. Memory cards with support for UHS-I are backwards compatible and can be used in devices without UHS support (with limited performance).
This card is optimised for apps and delivers fast start-up and more performance for your mobile applications. The App Performance Class is particularly important for SD cards used in smartphones and tablets. The A2 symbol indicates that the SD card fulfils the requirements of the corresponding App Performance Class 2 (A2): At least 4000/2000 IOPS for random transfers and at least 10 MB/s for sequential transfers.