Controls 4 computers from a single console (Keyboard/Mouse) over PS/2 and/or USB connections Supports Windows, Linux, Mac OS9/OSX, Sun Micro Solaris 8 (For Sun Micro users, the external power adaptor is necessary when using the KVM Switch). Emulates a keyboard on each PC to allow your computers to boot normally without a keyboard error. Supports hot-swap. All devices connected to the KVM can be added or removed at any time, without shutting the unit down. Supports 2 types of switching (1) Hardware Push Button, (2) Hot-Keys on PS/2 and/or USB of keyboard. Supports Auto-Scan function to alternate video between both computers in preset intervals. Easy switching via Hot Keys or logically designed port selectors Supports LED display for Selected and On-Line status monitoring. Supports VGA resolutions up to 2048 x 1536 maximum. Supports Beeper during Switching enabled. Self powered through PS/2 and/or USB connection (the optional power adapter is not included, and we do not stock it)Fully compliant with the USB 1.1/ 2.0 specification.