IOGEAR 4-Port Dual View Dual-Link DVI KVMP Switch with Audio, GCS1644 Dual Monitor Dual-Link DVI support - Share 2 DVI monitors with a single keyboard and mouse between 2 computers Quad View (DCC Mode) - When connecting 2 GCS1642X units together Increase security for your Intranet by separating a PC connected to the Internet and a PC connected to an Intranet Up to Dual-Link Resolution 2560 x 1600 when used with IOGEARs G2L7202U Up to 4K UHD 3840 x 2160 @30Hz resolution when used with IOGEARs GHDDVIC4K3, 4K sources, and 4K monitors