1. Applies to Cell Phones, Cameras, MP3/MP4 Player Action cameras, drones, game consolesand More device
2. Operating Temperature -13ordm F to 185ordm F (-25ordm C to 85 ordm C)
3. Storage Temperature -40ordm F to 185ordm F (-40ordm C to 85ordm C)

Warm Tips ( 2.0USB reader Test Result) :

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 Micro SD card speed is based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.

Hardware Features:

Original high quality flash memory
Manufactured in Taiwan
Assembled in China

About capacity:

4GB=approximately 3.6GB-3.8GB8GB=approximately 7.2GB-7.6GB16GB=approximately 14.4GB-14.8GB32GB=approximately 28.5GB-31GB64GB=approximately 58.5GB-62GB128GB=approximately 115GB-124GB

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;
This is calculation difference between manufacturer and our PC,just for you reference.