Want to save space on your mobile device by running apps from a memory card? Transcend microSDXC/SDHC 300S cards are the right choice! Compatible with the latest speed class, the cards offer excellent random read/write speeds, perfect for retrieving small chunks of data from random locations and speeding up application start-up times. Well suited for mobile app storage It is common for users to install and run mobile apps from microSD cards to free up device memory. Random number/write performance is therefore crucial. Transcend microSDXC/SDHC 300S memory cards are ideal for storing mobile applications. Introducing the Application Performance Class The Application Performance Class was introduced to accommodate this new trend. Transcend's microSDXC/SDHC 300S memory cards meet the new A1 standards, offering random read speeds of at least 1,500 IOPS and random write speeds of 500 IOPS, and sustained sequential speeds of at least 10 MB/s. A1 compatibility applies only to 128 GB capacity cards. View transfer capabilities Transcend 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. U3 and V30 compatibility applies only to 128GB capacity cards. Store as many as you want In addition to outstanding random read/write performance, Transcend microSDXC/SDHC 300S memory cards offer up to 128GB of storage capacity, so you can keep more digital files and applications at your fingertips! Made for the extreme Transcend microSD memory cards are tested to withstand extreme conditions for the best performance and stability. Waterproof: meets JIS IPX7 standards, withstanding immersion in 1 metre of water for up to 30 minutes. Temperature resistant: perform in extreme temperatures from -25°C to 85°C. Static electricity: meets EMC IEC61000-4-2 standards and is resistant to static electricity. X-ray resistant: meet ISO7816-1 standard and are immune to airport X-rays. Impact resistant: provides excellent resistance to shock, vibration, bending and torsion. RecoveRx software Transcend offers the unique RecoveRx software, a free data recovery program that allows you to search deep within your storage device for traces of deleted files, including digital photos, documents, music and videos. Adapter not included.