Features:

● Read Speed: 10MB -18MB/second
● Write Speed: 5MB -8MB/second
● USB 2.0 interface with higher speed and higher stability
● Portable, lightweight, high-quality metal protects the connector
●Environment Temperature:  -40°C - +70°C
●Storage Temperature: -50°C - +80°C
●USB Service Voltage: 4.5V-5.5V
●Storage Lifetime: More than 5 years
●Use A-class chip, can be erased repeatedly for 100,0000 times
●Operating System: Win98/ME/2000/XP/ Vista/win7 /win8, Mac OS 9.X/Linux2.4 or above
●USB connection:support Hot plug & Play.
●Easy to read and read in high speed ,No need drive/power supply only plug in.

About real capacity
128MB = approximately 110MB-120MB
4GB = approximately 3.6GB-3.9GB
8GB = approximately 7.4GB-7.8GB
16GB = approximately 14.2GB-15GB
32GB = approximately 28GB-30GB
64GB = approximately 58GB-60GB
128GB = approximately 110GB-120GB

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 1 GB = 1.00 Billion bytes.The pursuit of the perfect person is not recommended to buy.

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