Dsan PC-USB4 USB Port ExpanderThe DSAN USB Port Expander allows you to control up to four computers from a PerfectCue or PerfectCue Mini Signaling System over a Cat5 cable connection up to 300 ft. Simply connect the computers to the four USB ports on the Expander, and the PerfectCue to the RJ45 port. Furthermore, there's a second RJ45 port that allows you to daisy chain addition Expanders and effectively control any number of computers. The Expander is compatible with both Windows