The SV431DDVDUA 4-port DVI VGA dual monitor KVM switch lets you control 4 Dual Display computers using a single USB (Universal Serial Bus) mouse & keyboard peripheral set. This dual view KVM switch provides 1 VGA & 1 DVI-I port per computer connection for high-resolution video as well as audio switching capability between connected computers. The DVI/VGA KVM switch features an integrated 2-port USB (Universal Serial Bus) hub that allows USB (Universal Serial Bus) 2.0 peripherals to be shared between connected computers & offers a compact design with a rugged metal chassis for durable performance.NOTE While both DVI-I (analog) & DVI-D (digital) are supported by the KVM source PCs must output the same signal for proper switching. It is recommended wherever possible to use DVI-D cables across all PC to KVM & KVM to Console connections. If necessary please contact technical support for assistance identifying your source. Backed by a Star Tech.com 3-year warranty & free lifetime technical support The Star Tech.com Advantage High-resolution DVI & VGA ports support almost any dual display scenario; even with one DVI + VGA PC & one dual DVI PC an adapter can be used with this KVM to support your configuration Integrated USB (Universal Serial Bus) 2.0 hub & Mic/ Audio switching allows the user to have full multimedia control of two computers & share USB (Universal Serial Bus) peripherals eliminating the expense of duplicate devices Absolutely no software or drivers required providing a completely OS independent KVM solution.