4Port KVM switch is compact size design,easy portable Support Microsoft Intellimouse,Logitech Net Mouse,etc Support Dos,Win3.X,Win95/98/98SE/2000/ME/XP,WinNT,Netware,Unix,Linux Hot Plug-Add or Remove Connected PCs for Maintenance Without Powering Down the KVM switch or PCs. Very High Video Quality-Up To 1920?440,Bandwidth:200MHz No Software Required-easy PC selection via Push Buttons,Hot Keys. Auto Scan Mode for monitoring PCs. Keyboard status restored when switching PCs LED Display for easy status monitoring