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  Have four USB ports, support 2.0 version or 1.1 version
* Support high-speed Mbps, Full-Speed Mbps, 
Low Speed Mbps
* Protection for current overload.
* Support OS:LBM PC/MAC compatiblesIBM PC / MAC / MAC
* Fully compatible with all USB devices.
E.g. scanner, Camera, DV, MP3...
* Supports self-powered and bus-powered mode