Feature: 1.Micro SD Card + SD adapter 2.Plug and play (no software needed) 3.Micro SD + TF format,High-speed read and write 4.4GB,8GB,16GB,32GB,64GB,128GB Storage Size 5.Applies to Cell Phones, Cameras, MP3/MP4 Player and More device 6.Can be Used as Micro SD or SD Card 7.Operating Temperature – 13°F to 185°F(- 25°C to 85°C) 8.Storage Temperature – 40°F to 185°F (- 40°C to 85°C) About capacity: Capacity flash memory products are usually shipped in accordance with 1MB = 1000KB, 1G = 1000MB computing, but the operatingsystem using binary arithmetic 1MB=1024KB, 1GB = 1024MB, so there are some differences between the display capacity and standard capacity memory products.This is calculation difference between manufacturer and our PC. 4GB=approximately 3.6GB-3.8GB 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 This is calculation difference between manufacturer and our PC, please Google ‘Memory card capacity’ to get more information. About Speed: 4GB-Class 6-SDHC 8GB/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 The Micro SD card speed is based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. Micro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed. Hardware Features: Original high quality flash memory Manufactured in Taiwan Assembled in China Package Contents: 1 x microSD card with retail package and adapter.