USB2.0+1394 COMBO 5+3 ports card 1,Compliant with Universal Serial Bus (USB) Specification Revision 2.02,Compliant with Enhanced Host ... UHCI) Specification Revision 1.14,Backward compatibile with USB 1.1 Specification5,Data transfer rate: High Speed ... up to 127 USB devices simultaneously on each port7,External port: USB-A x48,Internal port: USB-A ... 64-bit/Vista, Mac OS USB2.0+1394 COMBO 5+3 ports card