Function use to connect imacmac mini post october 2009 macbook pro mac pro to camcordersportable hard drivesmedia devices via the firewire 400 mini port product features half duplex signal path allowing bi directional signal transfer but only one at a time high power charging flexible pvc cable jacket and strain relief 400mbs high speed data transfer connect imacmac mini post october 2009macbook promac pro to camcorderexternal hard drivemedia devices