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The Startech.com SV431UADVI is a 4-port DVI USB KVM Switch with Audio and Microphone switching functions. It allows you to control 4 USB-enabled multimedia computers with DVI video interfaces, using only one USB keyboard, mouse, monitor and a set of speakers and microphone. You can select the computers, USB device hub ports and audio/mic channels either simultaneously or independently, using either front-panel buttons or keyboard hotkeys. This DVI USB KVM Switch adopts the DVI interface technology that implements genuinely digital signal transmission over the cable to reduce undesired distortion from conventional analog/digital conversion.