4-port KVM switch with USB 2.0 support and 2.1 surround sound audio; One console controls four computers and two additional USB devices; 2-port USB 2.0 hub built in USB 2.0 compliant; Dual interface - supports computers with PS/2 or USB keyboard and mouse configurations; Audio enabled - full bass response provides a rich experience for 2.1 surround sound systems; Console audio ports on front panel for easy access - ideal for IP phone users; Independent switching of KVM, USB, and Audio focus; Superior video quality - 2048 x 1536 - DDC2B; Supports widescreen resolutions; Computer selection via front panel pushbuttons, multilingual OSD (On Screen Display), hotkeys and mouse; Multiplatform support - Windows, Mac and Sun; Console mouse port emulation / bypass feature supports full mouse driver and multifunction mice; Video DynaSync™ - stores the console monitor's EDID (Extended Display Identification Data) to optimize display resolution; Complete keyboard emulation for error-free booting; Sun/Mac keyboard support and emulation*; Auto Scan Mode for monitoring all computers; LED Display for easy status monitoring; Easy installation no software required; Firmware upgradeable