Want to save space on your mobile device by running apps from a memory card? Transcend's micro SDXCSDHC 300S cards are the right choice! Compliant with the latest speed class the cards boast excellent random readwrite speed perfect for retrieving small pieces of data from random locations & speeding app launch time A good fit for mobile app storage Its common for users to install & run mobile apps from micro SD cards in order to free device memory Random readwrite performance is thus crucial Transcend's micro SDXCSDHC 300S memory cards are a great fit for storing mobile apps Introducing Application Performance Class The Application Performance Class was introduced to adapt this new trend Transcend's micro SDXCSDHC 300S memory cards meet the new A1 standards delivering minimum random read of 1500 IOPS & random write of 500 IOPS & sustained sequential speeds of at least 10 M Bs Show the transfer capabilities Transcend's micro SDXCSDHC 300S memory cards meet both the UHS Speed Class 3 (U3) & the UHS Video Speed Class 30 (V30) standards for 4K Ultra HD video recordings with readwrite speeds of up to 95 M Bs & 45 M Bs respectively Built for extremes To deliver the best performance & stability Transcend's micro SD memory cards are tested to withstand extreme conditions They are temperature resistant waterproof shock proof X-ray proof & static proof