Extreme PRO Microsdxc UHS-I Card 64GB 128GB 256GB Memory Card A2 C10 U3 V30 4K UHD Video TF Card Read up to 200M/S

About capacity:
64GB = approximately 56GB-60GB
128GB = approximately 112GB-120GB
256GB = approximately 225GB-240GB
This is calculation difference between manufacturer and your PC, please Google 'Memory card capacity' to get more information.
Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1GB = 1.00 Billion bytes.

Note:
Speed based on internal testing. Actual performance may be lower depending on the device, interface, usage conditions and other factors.
1MB=1,000,000 bytes. 1GB=1,000,000,000 bytes. Actual user storage less.

Package
1*SanDisk Extreme PRO microSDXC UHS-I CARD(with retail package)

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