The Star Tech.com SV431DVIUAGB is a 4-port DVI USB (Universal Serial Bus) KVM Switch with Audio & Microphone switching functions. It means that you can control 4 USB (Universal Serial Bus)-enabled multimedia computers with DVI (Digital Video Interfaces), using only one USB (Universal Serial Bus) keyboard, mouse, monitor & a set of speakers & microphone. You can select the computers, USB (Universal Serial Bus) device hub ports & audio/mic channels either simultaneously or independently, using front-panel buttons. This DVI USB (Universal Serial Bus) 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. Feature Feature Value Keyboard port type USBMouse port type USBHeadphone outputs 1 Number of microphone inputs 1 Maximum resolution 1920 x 1440 pixels Product colour Black Package weight 1.6kg Connectivity technology Wired Power supply type DC 9 V Dimensions (Wx Dx H)45 x 253 x 115 mm Ports quantity 4