... speed USB2.0 4 port hub, metal case, for scanner,digital camera,digital vidicon, ... metal case, for scanner,digital camera,digital vidicon,audio system,input equipment etc.Metallic Hub: 1) Expand 4 USB ports ... power supply 4) Driverless, hot plug and play 5) Internal over current protection circuits6) Support compatible USB ... Mac OS 8.5 or over version high speed USB2.0 4 port hub, metal case(Model#PG-USB ...