Features: 1. Storage capacity: 8GB / 16GB / 32GB / 64GB; 2. Interface: USB 2.0; 3. Life:>1 million times; 4. Write/delect protection switch; 5. Fast speed in write / read transfer; 6. USB Service Voltage: 4.5V-5.5V; 7. Storage Temperature: -50°C - +80°C; 8. Environment Temperature:  -40°C - +70°C; 9. USB connection, support Hot plug & Play; 10. Solid State Storage, Shock proof and electromagnetic proof; 11. Hardware Requirement: PC with USB connection,Notebook, Macbook; Capacity: Flash memory vendors are using decimal arithmetic: 1MB = 1000KB, 1G = 1000MB calculated, but the operating system is using binary arithmetic: 1MB = 1024KB, 1GB = 1024MB. So there are some differences between display capacity and nominal capacity of flash memory products.However, this is allowed to exist. Please do not doubt his authenticity.   16GB =approximately 14.4GB-14.8GB32GB =approximately 28GB-29GB64GB =approximately 58GB-59GB128GB =approximately 115GB-120GB Speed: Class 6; Read Rate: 12Mb-18Mb/S;    Write Rate: 4-6Mb/S; Speed results for different conditions, using the software, copy the file type is different, speed measuring results are also different. Because of the different batch products,manufacturers under the condition of without notifying can adjust speed of products, please refer to our receiving Package Contents:  1 x USB flash drive Attention: 1.To avoid data loss or mechanical damage, do not power down your computer or unplug flash disk during transfer. 2. Please do not remove your USB flash drive when it is being used otherwise your data may loss. 3. After using USB flash drive, it is better to remove it as soon as possible. That will helps to extend its storage lifetime. 4. Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily.