Samsung microSD Class 4 4GB is a microSDC compatible storage accessory built for all kinds of people. Compatible for use with all smart devices featuring the microSD memory card slot, it can store all kinds of data such as HD videos and files along with offering tremendous transfer speeds. This memory card features UHS-I, Class 4 rating. It has read speeds up to 70MB/s and write speeds of up to 20MB/s. It is great for everyday use.