About capacity: 8GB=approximately 7GB-7.3GB This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information. Package Contents: Micro SD with Retail Package*1 Warm Tips: 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 40MB/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 bytes.
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