Transcend's microSDXC 300S memory card provides the performance and capacity required to harness the full power of your UHS-I compatible smartphone, tablet or other device In addition to incredible transfer speeds, the card meets the UHS Video Speed ​​Class 30 (V30) standard, which enables smooth and uninterrupted 4K video recording. - Supports Ultra High Speed ​​Class 3 specification (U3) and Video Speed ​​Class 30 (V30) br />- Class 10 compatible - App Performance Class 1 (A1) - Transfer speed: Up to 95MB/s read speed, Up to 40MB/s write speed* - Meets the JIS IPX7 standard (Can stand 1m under water for up to 30 minutes) - includes adapter to be used as an SDXC card * strong>Note! Speed ​​may vary depending on host hardware, software and usage.