The cards correspond to the latest speed class and are characterized by a very high read/write speed. This makes them ideal for retrieving small amounts of data from any location and accelerating app startup time. Users often install and run mobile applications on a game card to keep the internal memory of the mobile device free. The random read/write performance of the card is crucial for this application, which is why Transcend's microSDXC/SDHC 300S memory cards are ideal for storing mobile applications. The Application Performance Class was introduced to reflect this new trend. Transcend's microSDXC/SDHC 300S memory cards meet the new A1 standards and offer at least 1,500 IOPS for random reading and 500 IOPS for random writing, as well as a sustained sequential speed of at least 10 MB/s. Transcend's microSDXC/SDHC 300S memory cards meet both UHS Speed Class 3 (U3) and UHS Video Speed Class 30 (V30) standards for 4K Ultra HD video recording with read/write speeds of up to 95MB/s and 45MB/s, respectively. To deliver the best performance and stability, Transcend microSD memory cards are tested for extreme conditions. They are temperature-resistant, waterproof, shock-resistant, resistant to X-rays and can withstand static electricity.