☆ About Capacity: 32GB = Approximately 28GB-30GB 64GB = Approximately 58GB-60GB 128GB = Approximately 115GB-119GB 256GB = Approximately 230GB-238GB ☆ Description: 032GB: U3 / V30 / A1 / Class 10 / MicroSDHC 064GB: U3 / V30 / A1 / Class 10 / MicroSDXC 128GB: U3 / V30 / A1 / Class 10 / MicroSDXC 256GB: U3 / V30 / A1 / Class 10 / MicroSDXC ☆ Warm Tips: How to check the capacity and speed of the memory card? 1). Please use a high-quality USB 3.0 card reader to check. 2). Do not use a cheap card reader to test the Micro SD card. Using a low-quality card reader will slow down the speed of the Micro SD card. 3). The speed of the Micro SD memory card is greatly affected by the card reader and the selected capacity, USB port, etc. Low-quality devices will slow down the card speed by 100% ☆ New Version (Read/Write Speed) ● Class 10, High-quality crystal, Durable, Waterproof, Temperature resistant ● 32GB/64GB/128GB/256GB U3 Read Speed: 70-100MB/s, Write Speed: 15-30MB/s