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4PT DVI USB KVM SWCH W/ AUD The StarTech.com SV431DVIUA 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 (Digital 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 front-panel buttons. 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.