[DETAIL] Speed: 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. About capacity : 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 Features: Original high quality flash memory Manufactured in Taiwan Please don't use cheap card reader to test Micro SD card, speed of Micro SD card will be reduced by low quality card reader Micro SD card speed is greatly affected by card reader, adapter, USB port etc. Low quality device will 100% slow down card speed. Up to 20MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 byt es. Package Contents: 1 x  memory card 1 x SD adapter 1 x  Retail Package Warm Tips: 1. To most of countries about 30-50 days shipping time (Brazil maybe as long as to 90 days ) ,if you still not receive package when order protection time running out you can leave message to ask us extend the time and we will contact with shipping company to push up the shipping processing speed. 2.Anything question or problem to the product you received please contact with us before dispute and bad feedback ,we will reply and  give best sulution as soon as in 48 hours . [ATTRIBUTES] - Hign-concerned Chemical: None - Application: High Speed Read and Write,MOBILE PHONE,Tablet,NOTEBOOK,Tachograph,Camera,Monitoring,Speakers,Digital Devices,Robot,UAV,File Storage,others - Application Performance Class: A1 - Hign-concerned Chemical: None - Application: High Speed Read and Write,MOBILE PHONE,Tablet,NOTEBOOK,Tachograph,Camera,Monitoring,Speakers,Digital Devices,Robot,UAV,File Storage,others - Application Performance Class: A1 - Video Speed Class: V10 - UHS Level: U1 - Class Level: C10 - Package: Yes - Type: TF / Micro SD Card - Brand Name: stickdrive - Origin: TW(Origin) - Certification: None