Want to save space on your mobile device by running apps from a memory card? Transcend's microSDXC/SDHC 300S cards are the right choice! Compliant with the latest speed class, the cards boast excellent random read/write speed, perfect for retrieving small pieces of data from random locations and speeding app launch time.A good fit for mobile app storage It’s common for users to install and run mobile apps from microSD cards in order to free device memory. Random read/write performance is thus crucial. Transcend's microSDXC/SDHC 300S memory cards are a great fit for storing mobile apps. With a purchase of Transcend's microSDXC Class 10 UHS-I memory cards, you can download the exclusive RecoveRx software for free. This user-friendly application allows you to conduct an in-depth search within your storage device for traces of erased files to be recovered.Built for extremes To deliver the best performance and stability, Transcend's microSD memory cards are tested to withstand extreme conditions. Waterproof: meet JIS IPX7 standards that can withstand immersion in 1 meter of water for up to 30 minutes. Temperature proof: perform in temperature extremes from -25°C to 85°C. Static proof: meet EMC IEC61000-4-2 standards and withstand static electricity. X-ray proof: meet the ISO7816-1 standard and are immune to airport X-rays. Shock proof: provide excellent shock, vibration, bending and twisting resistance.Specifications Card type: Micro SDXC Capacity: 64GB* Read transfer rate: Up to 95MB/s Write transfer rate: Up to 45MB/s *Some capacity is used for formatting & other functions. 1GB = 1,000,000,000 bytes. Some operating systems measure GB differently, so capacity may appear less. . Speed may vary with operating conditions.