The Startech.Com Sv431dviuagb 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.