About Package: Original SanDisk Card with Retail package*1 About Speed: 8GB/16GB/32GB-Class 10 SDHC 64GB/128GB-Class 10 SDXC About capacity: 16GB=approximately 14GB-15GB 32GB=approximately 28GB-30GB 64GB=approximately 58GB-59GB 128GB=approximately 118GB-120GB This is calculation difference between manufacturer and our PC, please Google ‘Memory card capacity’ to get more information. Understanding speed classes: *The SD card association defines card speeds using two terms: Speed Class and UHS Speed Class. *Speed class is the original rating used and the number defines the card speed; 4 for 4MB/s, 6 for 6MB/s. 10 for 10MB/s etc. *UHS (Ultra High Speed) uses minimum write speeds to differentiate the cards; UHS-I Speed Class 1 has a minimum write speed of 10MB/s while UHS-I Speed Class 3 has a minimum write speed of 30MB/s. *Speed based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 byte *Please don’t use cheap card reader to test Micro SD card, speed of Micro SD card will be affected by low quality card reader （With high-quality 3.0 card reader and PC-side 3.0 USB interface） . *The most reliable software to verify memory card is H2testw.