Reliable and fast memory card for recording HD videos. Read speed: 140 MB/s, Write speed: 104 MB/s. Speed class: A1, Class 10, UHS-I. Suitable for capturing high-resolution photos as well as filming and editing Full HD videos. Includes SD adapter. The speed class indicates the minimum continuous data transfer rate when writing video files to a memory card. The speed class number shows the transfer rate in megabytes per second. Class 2 cards are designed for a minimum continuous transfer rate of 2 MB/s, while Class 10 cards are designed for a minimum continuous transfer rate of 10 MB/s. The speed classes are divided into classes 2, 4, 6, and 10. For Full HD video (1080p), a minimum of Class 6 is recommended. UHS-I bus system. UHS-I capable SD cards allow for theoretical data transfer speeds of up to 104 MB/s. The speed class is indicated as U1 or U3: U1 for Full HD videos and U3 for 4K videos. UHS-I supported memory cards are backward compatible and can be used in devices without UHS support (with limited performance). Application Performance Class A1. This card is optimized for apps, providing fast startup and enhanced performance for your mobile applications. The App Performance Class is particularly important for SD cards used in smartphones and tablets. The A1 symbol indicates that the SD card meets the requirements of the corresponding App Performance Class 1 (A1): at least 1,500/500 IOPS for random and at least 10 MB/s for sequential transfers.