Memory Card micro SDXC, 128GB, read speed up to 100MB/s, write speed up to 60MB/s, Class 10, UHS-I, U1 The Western Digital memory card is designed as a safe and secure and very small device for the storage of your data. The type of card is micro SDXC. This small format means it'll fit into mobile phones and other smaller electronics. It has a capacity total of 128 GB. It downloads data at a speed of 60 MB/s. Downloading from it is at a speed of 100 MB/s. The WD Purple QD101 SDXC 128GB belongs to the speed class of Class 10. Thanks to the device's parameters, it's suited for very demanding work like the saving of 4K video. WD Purple QD101 SDXC 128GB Memory Card Key Features micro SDXC memory card Interface type is UHS-I and U1 Memory card capacity: 128 GB Top reading speed of 100 MB/s Writing speed is 60 MB/s Western Digital memory card has the speed class of Class 10 Perfectly suited for recording 4K videos Even works in higher temperatures