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. Transcend's microSDXC/SDHC 300S memory cards have a capacity of up to 256GB, so you can store even more digital files and apps! 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.