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By certification 
Advantage of usb key:
1. Professional factory directly sale all over the world, offering the most competitive prices.
2. Superior quality, each USB flash drive undergoes stringent testing to guarantee its memory space and writing/reading speed meeting the standard.
3. We are able to manufacture customized USB flash drive according to your own creative ideas.
4. Deletable and undeletable file upload available.
Specification of usb key:
| Capacities | 1GB,2GB, 4GB, 8GB, 16GB, 32GB, 64GB |
| Interface type | USB2.0/3.0 |
| Material | Metal |
| Speed | Writing speed :3-8M/s .reading speed :12-20M/s |
| Simple | Just plug into any USB port |
| Convenient | Sturdy loop supports most key rings |
| Handy | Compact size |
| Guaranteed | 1-year warranty |
| Operating Temperature | 32°F to 140°F (0°C to 60°C) |
| Storage Temperature | 4°F to 185°F (-20°C to 85°C) |
| Operation system | Windows XP,Windows 2000, Windows Vista, Windows 7 or above |
| Accessories | Manual ,cd drive, USB cable, lanyard, keyring (optional) |
| Data retention | 10 years |
Product Show of usb key:
http://www.powerbanksusbs.com/
