TRIPP LITE 8-Port Rackmount DVI USB KVM Switch with Audio 2-Port 1URM USB Hub (B043-DUA8-SL) Net Controller 8-Port, 1U rack mount KVM switch Expand the number of connected computers by cascading an additional level of KVM switches. Control 8 computers via a single DVI monitor and USB keyboard/mouse Control up to 64 computers by cascading up to 8 additional B043-DUA8-SL KVM switches Compatible with all major operating systems 3-year limited warranty