The SanDisk 128GB microSDXC Memory Card Ultra Class 10 UHS-I with SD Adapter is a micro-size Secure Digital Extended Capacity memory card. With 128GB of data storage capacity, the card provides ample space for photos and videos captured with your camera or smartphone. It offers an SD Class 10 rating along with an Ultra High Speed Class 1 rating, for read speeds up to 80 MB/s and lower write speeds that should at least be able to exceed the Class 10 minimum of 10 MB/s. These speeds make the card ideal for capture and transfer of full HD 1080p video. A built-in write-protect switch found on the SD adapter prevents accidental data loss.