The Transcend microSDXC/SDHC 300S memory cards are designed to deliver exceptional performance and reliability for a wide range of applications. Boasting the latest Speed Class technology, these cards offer excellent random read/write speeds, making them perfect for quickly retrieving small pieces of data from random locations and speeding up app launch times.Meeting the new A1 standards, Transcend's microSDXC/SDHC 300S memory cards deliver minimum random read speeds of 1,500 IOPS and random write speeds of 500 IOPS, along with sustained sequential speeds of at least 10MB/s. This ensures smooth and efficient performance, even during intensive tasks.Furthermore, these memory cards meet both the UHS Speed Class 3 (U3) and the UHS Video Speed Class 30 (V30) standards, making them ideal for capturing 4K Ultra HD video recordings. With impressive read/write speeds of up to 95MB/s and 45MB/s respectively, users can rely on these cards for high-quality video recording.Transcend's microSDXC/SDHC 300S memory cards are built to withstand extreme conditions, including temperature fluctuations, water exposure, shocks, X-rays, and static. This ensures the safety and durability of your data, even in challenging environments.Backed by a 5-year warranty, users can trust in the reliability and longevity of Transcend's microSDXC/SDHC 300S memory cards, providing peace of mind for years to come. Overall, these memory cards offer a combination of high performance, compatibility, and durability, making them an excellent choice for various applications.