Monoprice 4-Port USB PS2 Combo KVM Switch - Black With Cables&nbsp;Retail | Supports Windows, Linux, Mac Controls four computers from a single console (Keyboard/Mouse) over PS/2 and/or USB connections Supports Windows, Linux, Mac OS9/OS X, 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-swapping. All devices connected to the KVM can be added or removed at any time, without shutting the unit down. Self powered through PS/2 and/or USB connection | Fully compliant with the USB 1.1/ 2.0 specification