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Overview and Specifications:

Plug and play (no software needed)
Mini SD + TF format,High-speed read and write
8GB,16GB,32GB,64GB,128GB Storage Size
Applies to Cell Phones, Cameras, MP3/MP4 Player and More device
Can be Used as Micro SD or SD Card
Operating Temperature – 13degF to 185degF(- 25degC to 85degC)
Storage Temperature – 40degF to 185degF (- 40degC to 85degC)

About capacity:
8GB=approximately 7.4GB-7.6GB
16GB=approximately 14.4GB-14.8GB
32GB=approximately 28.5GB-30GB
64GB=approximately 58.5GB-60GB
128GB=approximately 113GB-125GB
Vendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MB
Calculated, operating system with binary arithmetic: 1 MB = 1024KB, 1 GB = 1024 MB;
So there are some differences between display capacity and nominal capacity of flash memory products.
About Speed:
8GB/16GB/32GB-Class 10-SDHC
64GB/128GB-Class 10-SDXC
Class10: Read speed around 15-30MB/S ,Write speed around 9-12MB/S
The Mini SD card speed is based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.
Mini 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 miniSD card
1 x SD adapter
1 x retail package