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. With the OSD function you can name your computers switch to a computer from a list configure settings with easy-to-use menus view the name of the selected computer on-screen with programmable time interval. The OSD displays the system status throughout operation. Improved technology ensures steady OSD menu between computers of different VGA resolutions and smooth switching without leaving OSD garbage characters on the screen.Specification Supports both PS/2 and USB connections Hot-key functions allow easy computer access Plug and play system configuration Cascade configuration expands system capability High VGA resolution 1920 x 1440 Auto-scan automatically selects computers sequentially Operating system independent transparent to all applications Keyboard and mouse can be hot plugged at any time Optional standard 19 inch rack mounting accessories (Not Included) Keyboard states automatically saved and restored when switching computers