1. Downstream ports: USB 2.0 A typex4.
2. Noise level: 25dB maximum.
3. Air flow: 25CFM.
4. Fan dimension: 60 x 60 x 15mm.
5. Number of fan: two.
6. Fan speed: 2,500rpm maximum.
7. Port type: USB A and PS/2 extend power connect.
8. Cable length: 80cm +/- 3%mm, signal 55cm +/- 3%.
9. Operating current: 450mA maximum.
10. Supply voltage: 5V +/- 5%.
11. Weight: 500g +/- 5%.
12. System requirement: compatible with Windows.
13. XP/2000/Me/98, MAC OS 9 or higher.
14. Operation temperature: 0 to 40 degree Celsius.
15. Storage temperature: -15 to 60 degree Celsius.
16. Storage humidity: 90% RH or less.

we are the manufacture&exporter of different kinds cable in china .we can supply usb cables,ieee1394,SATA,QUDIO&VIDEO,DVI, HDMI,VGA,Serial,LAN CABLE,LFH CABLE CUSTOM CABLES etc, except this ,we have also produce usb gift .such as:usb fan,usb light, usb vacuum, usb warmer cup,usb hub and so on.