The Hybrid KVM CPU Switch Box allows you to access PS2 equipped computers (up to a maximum of 3) and USB equipped computers (up to a maximum of 4) from one PS2 Keyboard PS2 Mouse and VGA Monitor. There is no interface card or software to configure. Installation is as easy as connecting cables between the CPU Switch and your computers. Operation is as simple as pressing buttons entering hot-key command and navigating through the user-friendly on-screen menu (available on models with OSD support). The Hybrid KVM CPU Switch is independent of computer operating systems allowing the attached computers to run different Operating Systems or Applications. Specification Supports both PS/2 and USB connectionsHot-key functions allow easy computer accessPlug and play system configurationCascade configuration expands system capabilityHigh VGA resolution 1920 x 1440Auto-scan automatically selects computers sequentiallyOperating system independent transparent to all applicationsKeyboard and mouse can be hot plugged at any timeOptional standard 19 inch rack mounting accessories (Not Included)Keyboard states automatically saved and restored when switching computers