1. Storage capacity: 4GB.<br/> 2. Interface: USB 2.0.<br/> 3. Environment Temperature: -40°C - +70°C.<br/> 4. Storage Temperature: -50°C - +80°C.<br/> 5. USB Service Voltage: 4.5V-5.5V.<br/> 6. Storage Lifetime: More than 10 years of durable data storage.<br/> 7. Use A-class chip, can be erased repeatedly for 100,0000 times.<br/> 8. Easy to read and read in high speed ,no need drive/power supply only plug in.<br/> 9. Solid State Storage, Shock proof and electromagnetic proof.<br/> 10. Hardware Requirement: PC with USB connection,Notebook,MAC.<br/> 11. Operating System: Win98/ME/2000/XP/ Vista/win7 /win8, Mac OS 9.X/Linux2.4 or above USB connection,support Hot plug & Play.<br/><br/> Frequently Asked Questions :<br/> 1. Why I bought 4GB USB, but the computer show it is about 3.74GB?<br/> Because: Flash memory producers are using decimal arithmetic:1KB=1000Bit, 1MB=1000KB, 1G=1000MB Calculated, <br/> the operating system using binary arithmetic:1KB=1024Bit, 1MB=1024KB, 1GB=1024MB <br/> That is why there are some differences between display capacity and nominal capacity of flash memory product. <br/><br/> And different factories will produce different capacity USB flash drives.<br/> 4GB = approximately 3.6GB-3.8GB<br/> 8GB = approximately 7.1GB-7.6GB<br/> 16GB = approximately 14GB-15GB<br/> 32GB = approximately 28GB-30GB<br/> 64GB = approximately 58GB-60GB<br/> 128GB = approximately 115GB-121GB<br/> 256GB = approximately 240GB-252GB<br/><br/> Tips for Usage : <br/> 1. When you use your USB flash drive, it is better to copy your files to the computer than operate your files in USB flash drive directly.<br/> 2. Please do not remove your USB flash drive when it is being used otherwise your data may loss.<br/> 3. After using USB flash drive, it is better to remove it as soon as possible. That will helps to extend its storage lifetime.<br/> 4. Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily.<br/>