USB DVI KVM Switch, DT-series, 2-/4-Port Switch PCs with single-link DVI-D Video, transparent USB 2.0 or emulated USB K/M and bi-directional audio. Highest DVI video quality up to 1920x1200. DDC EDID Support via emulation. Switch up to four PCs. Version with emulated keyboard/mouse allows hotkey switching between attached PCs. Option with up to three transparent USB 2.0 ports allows switching via push buttons and peripheral sharing between attached PCs. Warranty: 3-years 4 port Switch ServSwitch DT DVI USB ServSwitch DT DVI USB KV9604A