SPECIFICATIONSApplication: MOBILE PHONE,Tablet,Tachograph,Monitoring,Speakers,Digital Devices,Robot,UAV,File StorageApplication Performance Class: A1Brand Name: NoEnName_NullCertification: CEChoice: yesClass Level: C10High-concerned chemical: NoneOrigin: Mainland ChinaPackage: YesSD Type: microSDXCType: TF / Micro SD CardUHS Level: U1Video Speed Class: V10semi_Choice: yes Description: 1.Micro SD Card 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 -13º F to 185º F (-25º C to 85 º C) 8.Storage Temperature -40º F to 185º F (-40º C to 85º C) Warm Tips( 2.0USB reader Test Result) : 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 About capacity: 4GB=approximately 3.6GB-3.8GB 8GB=approximately 7.2GB-7.6GB 16GB=approximately 14.4GB-14.8GB 32GB=approximately 28.5GB-30GB 64GB=approximately 58GB-60GB 128GB=approximately 113GB-124GB This is calculation difference between manufacturer and our PC, just for you reference. Package included: 1 X Micro sd card 1 X Retail package