Original Sandisk Extreme Pro Micro SD Card up to 170MB/s A2 V30 U3 64GB 128GB Sandisk TF Card Memory Card With SD Adapter

About capacity:16GB=approximately 14GB-15GB32GB=approximately 28GB-30GB64GB=approximately 58GB-59GB128GB=approximately 119GB-120GB This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information.Understanding speed classesThe 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 bytePlease don't use cheap card reader to test Micro SD card, speed of Micro SD card will be affected by low quality card reader. About Package:Original sandisk Card *1