1).Interface: USB 2.0, Compatible with USB 1.1

2).Expand four USB port, supply up to 500MA, current per port

3).No external power supply

4).Driverless, hot plug and play

5).Internal over current protection circuits

6).Chains up to 127 USB devices

7).Support OS: windows 95/98/2000/XP or MAC8.6 above

8).Data Transfer rate:1.5Mbps / 12Mbps / up to 480Mbps

9).Size:75x44x15mm