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! 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. Show the transfer capabilities Transcend's microSDXC/SDHC 300S memory cards meet both the UHS Speed Class 3 (U3) and the UHS Video Speed Class 30 (V30) standards for 4K Ultra HD video recordings, with read/write speeds of up to 95MB/s and 40MB/s respectively. Built for extremes Transcend's microSD memory cards are tested to withstand extreme conditions.