This is calculation difference between manufacturer(1GB=1000MB) and our PC(1GB=1024MB),
please Google Memory card capacity to get more information
How to verify the Capacity and Speed of the memory card?
1). Please use quality USB 3.0 card reader to verify all memory card by H2testw on PC. Real memory card should pass H2testw with no error.
2). 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.
3). Micro SD memory card speed is greatly affected by card reader and the capacity you choose , USB port ect. Low quality device will 100% slow down card speed,1MB=1000KB.
Get more from your device
The cards are speed rated at Class 10, and leverage UHS-I technology to deliver a transfer speed up to 100MB/s (633x)*. These high-capacity cards give you the speed and space you need to capture, transfer, and share more adventures on the go.
Capture more of your favorite content
Designed for your smartphones, tablets, or action cameras, Lexar® High-Performance 633x microSDHC™/SDXC™ UHS-I cards let you quickly capture, playback, and transfer a large number of multimedia files, including 1080p Full-HD, 3D, and 4K video. These Class 10 cards leverage UHS-I technology to deliver high-speed performance. Includes SD adapter for easy file transfer.
Capture adventures in HD
Calling all adventure seekers and adrenaline junkies! Make the most of your adventures in the great outdoors by leveraging the power and performance of these cards. So, whether you’re shooting the action with your action camera or an aerial camera, you can quickly capture, playback, and transfer a large amount of the highest quality 1080p full-HD, 3D, and 4K video—making it easy to store your greatest moments and then relive the action.
All Lexar product designs undergo extensive testing in the Lexar Quality Labs with more than 1,100 digital devices, to ensure performance, quality, compatibility, and reliability.