Product size: 15mm x 11mm x 1mm Color: As picture Capacity: 8GB/16GB/32GB/64GB/128GB Speed: 8-128G is Class6-Class 10, there is difference bewteen different PC and system File Format: FAT 32 Power supply: USB bus-powered (4.5V ~ 5.5V) Operating Current: Warranty: up to 1 year Package: 1 x micro sd card with retail box About speed 4GB----Class 6 8GB/16GB/32GB-----Class 10-SDHC 64GB/128GB/256GB-----Class 10-SDXC Class10: Read speed around 15-30MB/S ,Write speed around 9-12MB/S Note: 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. Capacity: 4gb = approximately 3.6GB-3.9GB 8gb = approximately 6.9GB-7.3GB 16gb = approximately 14GB-15GB 32gb = approximately 28GB-30GB 64gb = approximately 58GB-60GB 128gb= approximately 115GB-120GB @ This is calculation difference between manufacturer(1GB=1000MB) and our PC(1GB=1024MB), please Google 'Memory card capacity' to get more information
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