Upgrade the storage and performance of your mobile device using the 64GB 300S UHS-I microSDXC Memory Card from Transcend. Designed to retrieve small pieces of data from random locations and improving app launch times, the 300S has a capacity of 64GB, supports the UHS-I bus, and features a speed class rating of U1 / Class 10, which guarantees minimum write speeds of 10 MB/s. Read speeds are supported up to 95 MB/s and write speeds max out at 25 MB/s, also making this card suitable for Full HD video, plus raw and JPEG still photos and bursts.