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Overview and Specifications:

About capacity:                                                                                                                           
4GB=approximately 3.5GB-3.7GB
8GB=approximately 7GB-7.3GB
16GB=approximately 14GB-15GB
32GB=approximately 28GB-30GB
64GB=approximately 58GB-60GB
128GB=approximately 119GB-120GB
256GB=approximately 220GB-240GB
This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information

4GB/8GB- Class 4-6 SDHC
16GB/32GB- Class 10 SDHC
64GB/128GB- Class 10-SDXC
Class 6: Read speed around 15-20MB/S ,Write speed around 6-8MB/S
Class10: Read speed around 15-30MB/S ,Write speed around 9-12MB/S
1.The Micro SD card speed is based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.
2.Micro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed.

Package Contents:   
1 x  Micro SD card
1 x SD adapter
1 x Package