4-port Auto Mini USB KVM Switch: 1.  Use one keyboard, monitor, and mouse to control four    computers. 2.  Support Microsoft Intellimouse, Optical Mouse, Logitech Net Mouse and more. 3.   Support High Video Quality, up to 300MHz 2048 x 1536 VGA, or up to 800 x 600 SVGA resolution 4.   No software required, easy PC selection via Push Button and Hot-Key Commands. 5.   Auto-Scan Mode for monitoring PC's. 6.    Keyboard status restored when switching between PC's. 7.    LED display for easy status monitoring. 8.    Beeping sound for port switching confirmation.