. The SV431DUSBU 4 Port 1U Rack Mountable USB (Universal Serial Bus) KVM Switch with OSD lets you control multiple USB (Universal Serial Bus) based computers from a single console (USB keyboard USB (Universal Serial Bus) mouse monitor). Convenient push-button & hot-key controls provide quick reliable switching between connected computers while manual & auto-scan switching modes & an On Screen Display (OSD) offer additional control options. Designed to ensure maximum space efficiency the USB (Universal Serial Bus) KVM switch features a slim 1U design that fits neatly into a server equipment rack/cabinet (with optional mounting bracket. SV431RACK. ) & offers rear cable connections to eliminate cable tangles & minimize workspace disruption..